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Nonlinear Equations in One Variable and Systems of Equations

SAT Math· difficulty 3/5

Solve x2−9≥0x^2 - 9 \ge 0.

  • A

    −3≤x≤3-3 \le x \le 3

  • B

    x≤−3x \le -3 or x≥3x \ge 3

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  • C

    x≥3x \ge 3

  • D

    x≤−3x \le -3

Explanation

(x−3)(x+3)≥0(x-3)(x+3) \ge 0 outside the roots: x≤−3x \le -3 or x≥3x \ge 3.

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