Question on: JAMB Mathematics - 2007
The graph above is represented by
A
y = x3 - 3x - 2
B
y = x3 + 2x2 - x - 2
C
y = x3 - 4x2 + 5x - 2
D
y = x3 - 4x + 2
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Correct Option: B
x = -2, x = -1 and x = 1
then the factors; x+2, x+1 and x-1
Product of the factors; (x+2)(x+1)(x-1)
= y = (x + 2)(x2 - x + x - 1)
= y = (x+2)(x2-1)
x3 - x + 2x2 - 2 = y
x3 + 2x2 - x - 2 = y
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