Algebramedium · Past Paper
If x^2 + kx + 12 = 0 and one root is 4, find k.
A-7
B7
C1
D-1
✓ Correct Answer: A — -7
4^2 + 4k + 12 = 0 => 16 + 4k + 12 = 0 => 28 + 4k = 0 => k = -7.
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✓ Correct Answer: A — -7
4^2 + 4k + 12 = 0 => 16 + 4k + 12 = 0 => 28 + 4k = 0 => k = -7.
Share this question