{"id":8251,"date":"2012-01-26T17:12:13","date_gmt":"2012-01-27T01:12:13","guid":{"rendered":"https:\/\/magoosh.com\/gre\/?p=8251"},"modified":"2013-06-05T10:51:33","modified_gmt":"2013-06-05T17:51:33","slug":"will-there-be-parabolas-on-the-gre","status":"publish","type":"post","link":"https:\/\/magoosh.com\/gre\/will-there-be-parabolas-on-the-gre\/","title":{"rendered":"Will there be Parabolas on the GRE?"},"content":{"rendered":"<p>Probably not. Meaning that parabolas can show up on the GRE, but probably won\u2019t show up on the GRE you are taking. That is my initial take based on forums and students experiences. Still, parabolas, along with <a title=\"GRE Math: Absolute Values\" href=\"https:\/\/magoosh.com\/gre\/gre-math-absolute-values\/\" target=\"_blank\" rel=\"noopener noreferrer\">absolute value<\/a> graphs, are included in the <a title=\"ETS Practice Tests: Powerprep II and the Official Guide Book and CD\" href=\"https:\/\/magoosh.com\/gre\/ets-gre-practice-tests-powerprep\/\" target=\"_blank\" rel=\"noopener noreferrer\">Practicing to Take the Revised GRE book<\/a>. ETS obviously didn\u2019t put them there to kill more trees. So, like compound interest and the quadratic equation, parabolas may show up.<\/p>\n<p>What this means for your study plans is that you should only worry about parabolas if you are looking to score above 90%, and have already brushed up on the other concepts on the new GRE math. Meaning, if you are still struggling with number properties or circles, focus there.<\/p>\n<p>That said, below are some important things you have to know about parabolas.<\/p>\n<p>&nbsp;<\/p>\n<h2>Introduction to parabolas on the GRE<\/h2>\n<h2><\/h2>\n<h2>Symmetry<\/h2>\n<p>If you draw a line dividing a parabola in the middle, the parabola will be split into two equal halves. This line is known as the axis of symmetry. The shape of the parabola to the right of the axis symmetry is identical to the shape of the parabola the left of it.<\/p>\n<p>The axis of symmetry will either be a vertical line or a horizontal line, but the effect will always be the same: to split the parabola into two equal halves.<\/p>\n<h2><\/h2>\n<h2>The equation of a parabola<\/h2>\n<p>The equation for a parabola will always contain a coefficient, meaning that x is always squared: <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_00ba2f8841f4bdc479af1d446e2c7ef8.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"ax^2+bx+c=0\" title=\"ax^2+bx+c=0\"\/>. This may not be too helpful, so just think of it this way: <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_9c055c5f66a89c9f9b9123774cf7f344.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"x^2-2x+1\" title=\"x^2-2x+1\"\/>, when graphed, is a parabola. On the other hand, when the x is not squared, say, <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993_8ef2ccb59ca0a86ed0b715f14792d9d9.png\" style=\"vertical-align:-7px; display: inline-block ;\" alt=\"x-1=2\" title=\"x-1=2\"\/>, we have a simple line.<\/p>\n<p>The equation for a parabola can also be written as <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_990.5_aac041e3673505417972b24525dc1add.png\" style=\"vertical-align:-9.5px; display: inline-block ;\" alt=\"y=(x-1)^2+1\" title=\"y=(x-1)^2+1\"\/>. (This would turn out to be <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_335ed9cb7bd76a0fce254c0b8e94e097.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"x^2-2x+2\" title=\"x^2-2x+2\"\/> if written in the format in the preceding paragraph).<\/p>\n<p>This form is also known as the vertex form and is expressed as <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_990.5_ab28f00d04bd93c5d78eaf13fbe6cfa2.png\" style=\"vertical-align:-9.5px; display: inline-block ;\" alt=\"y=(x-h)^2+k\" title=\"y=(x-h)^2+k\"\/>. The reason this is call vertex form is it makes finding the vertex very easy.<\/p>\n<p>So how does all of this pertain to the new GRE? Well, remember the line of symmetry? To find it, we simply look at the value of h. In the example above, we have <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_990.5_aac041e3673505417972b24525dc1add.png\" style=\"vertical-align:-9.5px; display: inline-block ;\" alt=\"y=(x-1)^2+1\" title=\"y=(x-1)^2+1\"\/>, therefore h is equal to 1.<\/p>\n<p>Finally, there is the vertex, which is either the highest or lowest point depending on the equation (see horizontal vs. vertical, upwards vs. downwards). The vertex can always be represented by <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_990.5_ab0c59140bf4e0abb7ac98ac452449b0.png\" style=\"vertical-align:-9.5px; display: inline-block ;\" alt=\"(h, k)\" title=\"(h, k)\"\/>. Since h is already 1, we need to find k. This becomes straightforward if we put the following two equations next to each other:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_990.5_aac041e3673505417972b24525dc1add.png\" style=\"vertical-align:-9.5px; display: inline-block ;\" alt=\"y=(x-1)^2+1\" title=\"y=(x-1)^2+1\"\/> and <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_990.5_ab28f00d04bd93c5d78eaf13fbe6cfa2.png\" style=\"vertical-align:-9.5px; display: inline-block ;\" alt=\"y=(x-h)^2+k\" title=\"y=(x-h)^2+k\"\/><\/p>\n<p>Notice that the k is in the place of the 1 on the equation to the left. Therefore <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993_670aea792142bd687356f3815613cfdf.png\" style=\"vertical-align:-7px; display: inline-block ;\" alt=\"k = 1\" title=\"k = 1\"\/>. which is also 1. Hence the vertex.<\/p>\n<p>&nbsp;<\/p>\n<h2>Intersecting lines<\/h2>\n<p>The point at which a straight line intersects a parabola can be found by setting the equation for the line and the equation for the parabola equal to each other.\u00a0\u00a0 If a line intersects a parabola set the two lines equal to each other.<\/p>\n<p>For instance the line, <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993_7ee9b146c56d3c0d92ec7346e71fe3d8.png\" style=\"vertical-align:-7px; display: inline-block ;\" alt=\"y=2x-1\" title=\"y=2x-1\"\/> and the parabola <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_47789cbeeab10cf0c18192db4c9212b8.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"y=x^2\" title=\"y=x^2\"\/>, both equal y so we can set them to equal to each other: <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_b5a6191f1418647a16c810e461ad6548.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"2x-1=x^2\" title=\"2x-1=x^2\"\/>. We get <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_9c055c5f66a89c9f9b9123774cf7f344.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"x^2-2x+1\" title=\"x^2-2x+1\"\/>, which equals <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_990.5_108d9bf59833279ded4effcd1502b893.png\" style=\"vertical-align:-9.5px; display: inline-block ;\" alt=\"(x-1)^2\" title=\"(x-1)^2\"\/>. Therefore <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993_7fb9c0014bbe815faa91302f058b7ffd.png\" style=\"vertical-align:-7px; display: inline-block ;\" alt=\"x=1\" title=\"x=1\"\/>.<\/p>\n<p>To find y, we simply plug <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993_7fb9c0014bbe815faa91302f058b7ffd.png\" style=\"vertical-align:-7px; display: inline-block ;\" alt=\"x=1\" title=\"x=1\"\/> into either equation (they will always be the same). The answer then is 1. So the line and the parabola intersect at <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_990.5_b665c5b2343b8fc02299c83ff06d88f4.png\" style=\"vertical-align:-9.5px; display: inline-block ;\" alt=\"(1,1)\" title=\"(1,1)\"\/>.<\/p>\n<p>Sometimes a question will simply ask you at how many points a line intersects a parabola. A line can intersect a parabola at zero points, one point, or two points.<br \/>\nSometimes simply graphing out the parabola and the line is the easiest way to answer such a question.<\/p>\n<p>&nbsp;<\/p>\n<h2>Types of parabolas: horizontal vs. vertical, upwards vs. downwards<\/h2>\n<p>Let\u2019s have a look at two different parabolas:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_cb5d11ca3c546cb078b591e664fb48a4.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"x=y^2-1\" title=\"x=y^2-1\"\/><br \/>\n<img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_542e8953d6a6c4e32ee2bcb705348ac9.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"y=x^2-1\" title=\"y=x^2-1\"\/><\/p>\n<p>The two equations are identical, save that the x and y have been swapped. Whenever a parabola is equal to x it is horizontal, meaning that the axis of symmetry is horizontal.<\/p>\n<p>When the parabola is equal to y, the axis of symmetry is vertical.<\/p>\n<p>In the case of <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_cb5d11ca3c546cb078b591e664fb48a4.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"x=y^2-1\" title=\"x=y^2-1\"\/> the parabola opens to the right. In the case of <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_542e8953d6a6c4e32ee2bcb705348ac9.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"y=x^2-1\" title=\"y=x^2-1\"\/> the parabola opens upward.<\/p>\n<p>Now have a look at the following equations:<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_983.5_7e0487cd695b1baf1a29ea4c84e7f679.png\" style=\"vertical-align:-16.5px; display: inline-block ;\" alt=\"x =-(y^2)-1\" title=\"x =-(y^2)-1\"\/><br \/>\n<img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_983.5_7dbaa487e64fa38fda714c389045b68e.png\" style=\"vertical-align:-16.5px; display: inline-block ;\" alt=\"y =-(x^2)-1\" title=\"y =-(x^2)-1\"\/><\/p>\n<p>This pair of equations is identical to the ones above, except for there is a negative in front of both <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_cb1f6a5193a2f77087b50cf09e47f996.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"y^2\" title=\"y^2\"\/> and <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_39f0ebcd1f89a04b5042e06d6be959ed.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"x^2\" title=\"x^2\"\/>. This negative flips the direction of each parabola.<\/p>\n<p><img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_983.5_b83fa4100f50ef3c1648281f1057fece.png\" style=\"vertical-align:-16.5px; display: inline-block ;\" alt=\"x=-(y^2)-1\" title=\"x=-(y^2)-1\"\/> opens to the left and <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_983.5_bb55d5f72f11ce5d3d0ecf177d9d75af.png\" style=\"vertical-align:-16.5px; display: inline-block ;\" alt=\"y=-(x^2)-1\" title=\"y=-(x^2)-1\"\/> opens downwards.<\/p>\n<p>If this all seems very abstract take a look at the video above.<\/p>\n<p>&nbsp;<\/p>\n<h2>Skinny vs. fat parabolas<\/h2>\n<p>Finally, a parabola can change its shape depending on whether the coefficient (or number) next to <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_39f0ebcd1f89a04b5042e06d6be959ed.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"x^2\" title=\"x^2\"\/> is less than or greater than one. For instance, in the equation<br \/>\n<img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_993.5_2935913d4c7c25d91a7113b54cccf214.png\" style=\"vertical-align:-6.5px; display: inline-block ;\" alt=\"y=3x^2\" title=\"y=3x^2\"\/> the coefficient is 3, so we will have a \u2018skinny\u2019 parabola\u2014that is, the great the coefficient the skinnier the parabola. On the other hand, in <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_984_0d2de24a460a1eff2488cdb651a20dc4.png\" style=\"vertical-align:-16px; display: inline-block ;\" alt=\"y={1\/3}x^2\" title=\"y={1\/3}x^2\"\/>, the coefficient is <img decoding=\"async\" src=\"https:\/\/magoosh.com\/gre\/wp-content\/plugins\/wpmathpub\/phpmathpublisher\/img\/math_984_2e4443c1715cf120ad8bffb42c93d71b.png\" style=\"vertical-align:-16px; display: inline-block ;\" alt=\"1\/3\" title=\"1\/3\"\/> so we will have a \u2018fat\u2019 parabola.<\/p>\n<p>(Skinny and fat are my terms not standard math-ese. So if you whip them out in front of math inclined folk you are likely to get some very quizzical looks).<\/p>\n<p>&nbsp;<\/p>\n<h2>Takeaway<\/h2>\n<p>There is much to learn on parabolas, as you can see from the post above. However, there is little likelihood that a parabola will even show up on the test so study only if you are aiming for a top math score.<\/p>\n<p>The accompanying video should hopefully make what I covered in this post far less abstract.<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Probably not. Meaning that parabolas can show up on the GRE, but probably won\u2019t show up on the GRE you are taking. That is my initial take based on forums and students experiences. Still, parabolas, along with absolute value graphs, are included in the Practicing to Take the Revised GRE book. ETS obviously didn\u2019t put [&hellip;]<\/p>\n","protected":false},"author":10,"featured_media":0,"comment_status":"open","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[42,25],"tags":[],"ppma_author":[12264],"class_list":["post-8251","post","type-post","status-publish","format-standard","hentry","category-geometry","category-math"],"acf":[],"yoast_head":"<!-- This site is optimized with the Yoast SEO Premium plugin v21.7 (Yoast SEO v21.7) - https:\/\/yoast.com\/wordpress\/plugins\/seo\/ -->\n<title>Will there be Parabolas on the GRE? - Magoosh Blog \u2014 GRE\u00ae Test<\/title>\n<meta name=\"description\" content=\"If you\u2019re aiming for a top math score on the GRE, you might want to learn more about parabolas. 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