Algebrahard · Past Paper
If the roots of x^2 - kx + 1 = 0 are not real, then k lies in:
A(-2, 2)
B(-∞, -2)
C(2, ∞)
D[-2, 2]
✓ Correct Answer: A — (-2, 2)
D < 0 → k^2 - 4 < 0 → k^2 < 4 → -2 < k < 2.
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✓ Correct Answer: A — (-2, 2)
D < 0 → k^2 - 4 < 0 → k^2 < 4 → -2 < k < 2.
Share this question