{"id":"cb_question_bank:5361a02e-9b23-4251-93b8-5cc489b48d48","source_id":"cb_question_bank","source_item_id":"5361a02e-9b23-4251-93b8-5cc489b48d48","external_id":null,"ibn":"070621-DC","question_id":"97e50fa2","program":"SAT","module":"math","domain_code":"P","domain":"Advanced Math","skill_code":"P.B.","skill":"Nonlinear equations in one variable and systems of equations in two variables","difficulty":"H","score_band":6,"answer_type":"spr","answer_source":"rationale","layout_warning":null,"form_id":null,"module_number":null,"position":null,"stem":"The graph of the function f , defined by f of x equals, negative one-half times, open parenthesis, x minus 4, close parenthesis, squared, plus 10 , is shown in the xy -plane above. If the function g (not shown) is defined by g of x equals, negative x plus 10 , what is one possible value of a such that f of a equals, g of a ?","stimulus":"The figure presents the graph of a curve in the xy-plane. The curve is labeled y equals f of x. The numbers 0 through 9 are indicated on the x-axis. The numbers 0 through 12, in increments of 2, are indicated on the y-axis. The curve begins at the point with coordinates 0 comma 2 and moves upward and to the right reaching a maximum at the point with coordinates 4 comma 10. It turns and moves downward and to the right, ending at 8 point 5 on the x-axis","stimulus_html":"<div class=\"stimulus_reference \">\n        <div class=\"standalone_image \">\n          <img src=\"/api/assets/253ccc19556a1b81194d490064b7b05274a4f0fb4b50baa3153d1801f2d4f53b\" alt=\"The figure presents the graph of a curve in the xy-plane. The curve is labeled y equals f of x. The numbers 0 through 9 are indicated on the x-axis. The numbers 0 through 12, in increments of 2, are indicated on the y-axis. The curve begins at the point with coordinates 0 comma 2 and moves upward and to the right reaching a maximum at the point with coordinates 4 comma 10. It turns and moves downward and to the right, ending at 8 point 5 on the x-axis\" width=\"222\" height=\"169\"></div>\n      </div>\n","stem_html":"<p class=\"stem_paragraph \">The graph of the function <span class=\"italic\">f</span>, defined by <span class=\"math_expression \"><span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/9f5cbbd39f234feb154581c0f1473f48b216580537dda134785692b9626011c8\" alt=\"f of x equals, negative one-half times, open parenthesis, x minus 4, close parenthesis, squared, plus 10\"></span></span>, is shown in the <span class=\"italic\"><span class=\"italic \">xy</span></span>-plane above. If the function <span class=\"italic\">g</span> (not shown) is defined by <span class=\"math_expression \"><span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/d8e7bd1a296750e627bd9778044429ebaffce13ab9d4eb031e8f099e4abd8c54\" alt=\"g of x equals, negative x plus 10\"></span></span>, what is one possible value of <span class=\"italic\">a</span> such that <span class=\"math_expression \"><span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/72aeb2bcbf508f84fc065c4e0a246cc51f6a339206a0136e8866a658299903c8\" alt=\"f of a equals, g of a\"></span></span> ?</p>\n","rationale_html":"<p>The correct answer is either 2 or 8. Substituting <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/c45279a9f13d7cb25d5960055218fa9c4d8e5cc0c7d4bd05665857b612170438\" alt=\"x equals a\"></span> in the definitions for <span class=\"italic\">f</span> and <span class=\"italic\">g</span> gives <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/627ec8f1ac3532830e95cc23e4bad9baa4bc4d7dc8d11f3314bead8242a2f0e3\" alt=\"f of a, equals, negative one half times, open parenthesis, a, minus 4, close parenthesis, squared, plus 10\"></span> and <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/6105f6af9da0d73c1f96bf89c740154888c2f9b225ee10326de9a42408ab489e\" alt=\"g of a, equals, negative a, plus 10\"></span>, respectively. If <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/72aeb2bcbf508f84fc065c4e0a246cc51f6a339206a0136e8866a658299903c8\" alt=\"f of a, equals, g of a\"></span>, then <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/95d6efe9864f5726a473713d8d7d8ad6b49ddafd9db1770e06b3c03b6da0ec6e\" alt=\"negative one half times, open parenthesis, a, minus 4, close parenthesis, squared, plus 10, equals, negative a, plus 10\"></span>. Subtracting 10 from both sides of this equation gives <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/0752b57318e5a3f217325ae01071971cc87e1b2305a31d4c33b62a7153bf70b1\" alt=\"negative one half times, open parenthesis, a, minus 4, close parenthesis, squared, equals negative a\"></span>. Multiplying both sides by <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/a546b5be2c97283e2d1e93605f422844d5a87f3418a61a7d23019eb596b64f17\" alt=\"negative 2\"></span> gives <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/edc64cbd8dd170fc94c8e6f9bb1df52c9d5fbffb8dc346651c1d0d82eb9dff8a\" alt=\"open parenthesis, a, minus 4, close parenthesis, squared, equals 2 a\"></span>. Expanding <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/e05f723fbabdc5afe93cfadc149ccd3cb67055d9b3a7e670ccd2780d488f324c\" alt=\"open parenthesis, a, minus 4, close parenthesis, squared\"></span> gives <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/329c7c9ded269345ab17252681afabeefaf7fbf04cdb64b8c79f744a8220e3a1\" alt=\"a, squared, minus 8 a, plus 16, equals 2 a\"></span>. Combining the like terms on one side of the equation gives <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/0333c5c88290c70c7f4cad8d118006a45c626a9c19d3045c193fc259db6dc6ce\" alt=\"a, squared, minus 10 a, plus 16, equals 0\"></span>. One way to solve this equation is to factor <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/32a197a9b56269c97a7396fccffdc902df142759867a33d51c372c072e7853db\" alt=\"a, squared, minus 10 a, plus 16\"></span> by identifying two numbers with a sum of <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/ad164812a80c0475e5873fe6efabe36125775875aafcc712f297eee699b6bec1\" alt=\"negative 10\"></span> and a product of 16. These numbers are <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/a546b5be2c97283e2d1e93605f422844d5a87f3418a61a7d23019eb596b64f17\" alt=\"negative 2\"></span> and <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/0074a4418aa88cd673760d477e8b81bfb5e2a1a048bed34062ed94e05b6de763\" alt=\"negative 8\"></span>, so the quadratic equation can be factored as <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/168002be8e4287fdc23075c676aed566e0950e39920617a6065b3ffa8d81992d\" alt=\"open parenthesis, a, minus 2, close parenthesis, times, open parenthesis, a, minus 8, close parenthesis, equals 0\"></span>. Therefore, the possible values of <span class=\"italic\">a</span> are either 2 or 8. Note that 2 and 8 are examples of ways to enter a correct answer.</p><p>Alternate approach: Graphically, the condition <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/72aeb2bcbf508f84fc065c4e0a246cc51f6a339206a0136e8866a658299903c8\" alt=\"f of a, equals, g of a\"></span> implies the graphs of the functions <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/1e01733cd755d260e76d5f12c4cac64337f711b1e9607c6bccfbf87900f24efe\" alt=\"y equals f of x\"></span> and <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/6fcd05cf4e0ffa0d94bd4ba8a544cae4f5dc2871e56a9b5e0f5722a0a8e57bc1\" alt=\"y equals g of x\"></span> intersect at <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/c45279a9f13d7cb25d5960055218fa9c4d8e5cc0c7d4bd05665857b612170438\" alt=\"x equals a\"></span>. The graph <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/1e01733cd755d260e76d5f12c4cac64337f711b1e9607c6bccfbf87900f24efe\" alt=\"y equals f of x\"></span> is given, and the graph of <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/6fcd05cf4e0ffa0d94bd4ba8a544cae4f5dc2871e56a9b5e0f5722a0a8e57bc1\" alt=\"y equals g of x\"></span> may be sketched as a line with <span class=\"italic\">y</span>-intercept 10 and a slope of <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/c1e573ec087416273e06563cee97890abeeed317436562b06a92c8920d4c759d\" alt=\"negative 1\"></span> (taking care to note the different scales on each axis). These two graphs intersect at <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/401169281090f4f1d9aafeeb928524e672d737cdce814b4e9256c5e06a42d325\" alt=\"x equals 2\"></span> and <span class=\"math-container\"><img align=\"middle\" role=\"math\" class=\"math-img\" src=\"/api/assets/a96e9d385800b7527327e54feec0d311f481505d8d4219d42e8ba89899a239ea\" alt=\"x equals 8\"></span>.</p><p></p>\n","correct_answer":["2","8"],"has_media":true,"has_mathml":false,"has_table":false,"source_created_at":"2023-08-02T20:25:59.631000+00:00","source_updated_at":"2023-08-02T20:25:59.631000+00:00","options":[],"attribution":{"source_id":"cb_question_bank","source_name":"College Board digital SAT question bank (community dump)","rights_holder":"College Board","canonical_url":"https://satsuitequestionbank.collegeboard.org/","retrieved_from":"https://raw.githubusercontent.com/mdn522/sat-question-bank/main/data/cb-digital-questions.json","attribution":"SAT practice questions © College Board, from the official SAT Suite Question Bank. Retrieved via the community dump at github.com/mdn522/sat-question-bank.","disclaimer":"SAT® and PSAT/NMSQT® are trademarks registered by the College Board, which is not affiliated with, does not sponsor, and does not endorse this project.","license":"College Board copyright; source repository carries no licence. Local use only.","redistributable":false,"item_count":2017}}