2007
Mathematics
67ca00ce0c643c71d77dee1f
The solution of the quadratic inequality (x3 + x - 12) ≥ 0 is
A.
x ≥ -3 or x ≤ 4
B.
x ≥ 3 or x ≥ -4
C.
x ≤ 3 or x v -4
D.
x ≥ 3 or x ≤ -4
Correct Answer: x ≥ 3 or x ≥ -4
Explanation
(x3 + x - 12) ≥ 0 (x + 4)(x - 3) ≥ 0 Either x + 4 ≥ 0 implies x ≥ -4 Or x - 3 ≥ 0 implies x ≥ 3 ∴ x ≥ 3 or x ≥ -4
(x3 + x - 12) ≥ 0 (x + 4)(x - 3) ≥ 0 Either x + 4 ≥ 0 implies x ≥ -4 Or x - 3 ≥ 0 implies x ≥ 3 ∴ x ≥ 3 or x ≥ -4THIS WEEK's
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