A number is subtracted from two times its square and the result is 45

MATHEMATICS · Single correct · AoPS · Mathematics · One-Variable Linear Equations · One-Variable Linear Equations

Problem

A number xx is subtracted from two times its square and the result is 45. An equation to find the value of xx would be: (1) A: x2−2x=45x^2 - 2x = 45 (2) B: 2x−x2=452x - x^2 = 45 (3) C: 2x2−x=452x^2 - x = 45 (4) D: 2x2−2x=452x^2 - 2x = 45 (5) E: x−2x2=45x - 2x^2 = 45

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