{"id":"cb_practice_pdf:t8-math-m1-q4","source_id":"cb_practice_pdf","source_item_id":"t8-math-m1-q4","external_id":null,"ibn":null,"question_id":null,"program":"SAT","module":"math","domain_code":null,"domain":null,"skill_code":null,"skill":null,"difficulty":null,"score_band":null,"answer_type":"mcq","answer_source":"rationale","layout_warning":"Part of this question was typeset outside the text flow — a fraction, subscript or similar — and PDF extraction re-inserted it in the wrong place. The wording is reliable; the symbols may be out of order.","form_id":"cb_practice_pdf:test-8","module_number":1,"position":4,"stem":"Which expression_2 is equivalent to 2 x^2 + x −9 + x +6 x +1 () ()? 2x^2 +7x+10","stimulus":"","stimulus_html":null,"stem_html":"<p>Which expression_2 is equivalent to 2 x^2 + x −9 + x +6 x +1 () ()? 2x^2 +7x+10</p>","rationale_html":"<p>Choice D is correct. The given expression is equivalent 2 2+ + -9 + 2+6 +1 to ^ x x ^ hh ^x x h, which can be rewritten as 2 2+ 2 + +6 + -9+1 ^ x x h ^x xh ^ h. Adding like terms in this expression yields 3 2+7 + -8 3 2+7 -8 x x ^ h, or x x . Choice A is incorrect and may result from conceptual or calculation errors. Choice B is incorrect and may result from conceptual or calculation errors. Choice C is incorrect and may result from conceptual or calculation errors.</p>","correct_answer":["D"],"has_media":false,"has_mathml":false,"has_table":false,"source_created_at":null,"source_updated_at":null,"options":[{"label":"A","content_html":"<p>2x^2 +6x−8</p>","ord":0},{"label":"B","content_html":"<p>3x^2 +7x−10</p>","ord":1},{"label":"C","content_html":"<p>3x^2 +7x−8</p>","ord":2},{"label":"D","content_html":"","ord":3}],"attribution":{"source_id":"cb_practice_pdf","source_name":"College Board full-length SAT practice tests (PDF)","rights_holder":"College Board","canonical_url":"https://satsuite.collegeboard.org/practice/practice-tests/paper","retrieved_from":"https://satsuite.collegeboard.org/practice/practice-tests/paper","attribution":"Full-length SAT practice tests 4–11 © College Board, published free at satsuite.collegeboard.org.","disclaimer":"Extracted from PDF layout: equations, figures and tables do not survive intact. Use the original PDFs for anything the text renders poorly. SAT® is a trademark registered by the College Board, which is not affiliated with and does not endorse this project.","license":"College Board copyright. Free to download; not licensed for redistribution.","redistributable":false,"item_count":905}}