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Nonlinear Equations in One Variable and Systems of Equations

SAT Math· difficulty 4/5

Solve x2+2x−8>0x^2 + 2x - 8 > 0.

  • A

    −2<x<4-2 < x < 4

  • B

    x<−4x < -4 or x>2x > 2

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  • C

    −4<x<2-4 < x < 2

  • D

    x<−2x < -2 or x>4x > 4

Explanation

(x+4)(x−2)>0(x+4)(x-2) > 0: outside the roots, so x<−4x < -4 or x>2x > 2.

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