Algebramedium · Past Paper
If x + 2 is a factor of x^3 + 2x^2 - x + k, find k.
A2
B-2
C0
D1
✓ Correct Answer: B — -2
By Factor Theorem, P(-2) = 0. (-2)^3 + 2(-2)^2 - (-2) + k = -8 + 8 + 2 + k = 0, so k = -2.
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✓ Correct Answer: B — -2
By Factor Theorem, P(-2) = 0. (-2)^3 + 2(-2)^2 - (-2) + k = -8 + 8 + 2 + k = 0, so k = -2.
Share this question