JAMB - Mathematics (1997 - No. 9)

If the function f(fx) = x3 + 2x2 + qx - 6 is divisible by x + 1, find q
-5
-2
2
5

Explanation

x + 1 = 0, x = -1; f(x) = x3 + 2x2 + qx - 6

0 = -1 + 2 - q - 6

q = -5

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