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MATHEMATICS

JAMB 2007 - Question 19

Mathematics 2007 JAMB Past Questions - Question 19: The solution of the quadratic inequality ( x² + x – 12) ≥ 0 is

The solution of the quadratic inequality ( x² + x – 12) ≥ 0 is

A: x ≥3 or x≤4

B: x ≥3 or x ≥-4

C: x≤ 3 or≤-4

D: x ≥3 or x≤-4

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Correct Answer

Explanation

x² + x – 12 ≥ 0 → x² + 4x – 3x – 12 ≥ 0→x(x+4) -3(x+4) ≥ 0 (x-3)(x+4) ≥ 0 → x ≥ 3 or ≤ -4