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Home / Aptitude Tests / Mathematics / The solution of the ...
The solution of the quadratic inequality (x3 + x ...

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

View answer & explanation

Correct answer is B

(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


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