Algebrahard · Past Paper
If x+1 is a factor of x^3 + kx^2 + 3x + 1, find k.
A3
B4
C5
D2
✓ Correct Answer: A — 3
By factor theorem, P(-1) = 0. (-1)^3 + k(-1)^2 + 3(-1) + 1 = 0 => -1 + k - 3 + 1 = 0 => k = 3.
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✓ Correct Answer: A — 3
By factor theorem, P(-1) = 0. (-1)^3 + k(-1)^2 + 3(-1) + 1 = 0 => -1 + k - 3 + 1 = 0 => k = 3.
Share this question