Question

If x is equal to minus 4 for solution of the polynomial quadratic equation x square + kx + - 4 equal to zero

Answer 1

x = -4

x^2 + kx + (-4) = 0

x^2 + kx - 4 = 0

(-4)^2 + k(-4) - 4 = 0

16 - 4k = 4

-4k = 4 - 16

-4k = -12

4k = 12

K = 12/4

K = 3

Hence the value of K is 3

I hope this will help you........