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Find the values of k quadratic equation x^2 - kx + 9 = 0 has real and distinct roots.

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Find the values of k quadratic equation x2 - kx + 9 = 0 has real and distinct roots.

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a = 1, b = – k, c = 9

For real and distinct roots, then D > 0

(-k)2 – 36 > 0

k > 6 

or k < -6

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