Find the value of k, if one of the roots...

Find the value of k, if one of the roots of the quadratic equation `:`
(i) ` x^(2) -kx + 12 = 0 ` is 3 (ii) `kx^(2) - 11x + 12 = 0` is 4
(iii) `6p^(2) 5p + k =0 ` I s `- (3)/(2)` (iv) `kx^(2) - 11x - 6 =0 ` is ` - (1)/(2)`

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