If y x2 - x - 12 find the range of values of x ... - JAMB Mathematics 2006 Question
If y = x2 - x - 12, find the range of values of x for which y \(\geq\) 0,
A
-3 < x \(\leq\) 4
B
x , -3 or x > 4
C
-3 \(\leq\) x \(\leq\) 4
D
x \(\leq\) -3 or x \(\geq\) 4
correct option: c
y = x2 - x - 12, let y = 0
x2 - x - 12 = 0, (x + 3)(x - 4) = 0
x = -3 or 4
ranges are -3 and 4
x2 - x - 12 = 0, (x + 3)(x - 4) = 0
x = -3 or 4
ranges are -3 and 4
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