n^(2)-2kx-6

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If x=3 is one root of the quadratic equation x^(2)-2kx-6=0, then find the value of k

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If (x-6) is the HCF of x^2- 2x - 24 and x^2-kx-6 , then what is the value of k is

If (x-6) is the HCF of x^(2) -2x-24 and x^(2) - kx - 6 , then what is the value of k ?

The vlaue of k is …………if x =3 is one rot of x ^(2) - 2kx -6=0.