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Nonlinear Equations in One Variable and Systems of Equations

SAT Math· difficulty 3/5

Solve x2+8x+16=0x^2 + 8x + 16 = 0.

  • A

    x=−4x = -4 only

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  • B

    x=4x = 4 only

  • C

    x=−8,2x = -8, 2

  • D

    x=±4x = \pm 4

Explanation

(x+4)2=0(x+4)^2 = 0, double root at x=−4x = -4.

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