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MATHEMATICS

JAMB 2006 - Question 49

Mathematics 2006 JAMB Past Questions - Question 49: If y=x² -x-12, find the range of values of x for which y ≥ 0.

Choose the most appropriate option for the gap .

If y=x² -x-12, find the range of values of x for which y ≥ 0.

A: x<-3 or x>4

B: x≤3or x ≥ 4

C: -3

D: -3≤x≤4

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Correct Answer

Explanation

y = xsup2 - x 12, let y =0xsup2 - x - 12 = 0, (x+3) (x-4) = 0x = -3 or 4Rangers are -3 and 4