Question 120921
If 4x^2+kx+6=0 has one real root, find k.
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You are right about the discriminant.
The discriminant must be zero if there is to be only one real root.
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k^2-4*4*6=0
k^2-96=0
k = sqrt96 or k=-sqrt96
k = 4sqrt6 or k= -4sqrt6
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Cheers,
Stan H.