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Nonlinear Equations in One Variable and Systems of Equations

SAT Math· difficulty 4/5

Which graph has xx-values where −x2+4>0-x^2 + 4 > 0?

  • A

    x≥0x \ge 0

  • B

    All real xx

  • C

    x<−2x < -2 or x>2x > 2

  • D

    −2<x<2-2 < x < 2

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Explanation

−x2+4>0-x^2 + 4 > 0 means x2<4x^2 < 4, so −2<x<2-2 < x < 2.

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