In each of the following; find the value of k for which the given value is a solution of the give...

In each of the following; find the value of k for which the given value is a solution of the given equation:
(i) 7 x^2+k x-3=0, x=2 / 3
(ii) x^2-x(a+b)+k=0, x=a
(iii) k x^2+√(2) x-4=0, x=√(2)
(iv) x^2+3 a x+k=0, x=-a
(W)

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