Algebramedium · Past Paper
If roots of x^2 - kx + 4 = 0 are equal, find k.
A±4
B4
C2
D16
✓ Correct Answer: A — ±4
D = k^2 - 4(1)(4) = 0 => k^2 = 16 => k = ±4.
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✓ Correct Answer: A — ±4
D = k^2 - 4(1)(4) = 0 => k^2 = 16 => k = ±4.
Share this question