Question

If 5 is a zero of x cube + k x square + 2 x + 8 find k if 5 is a zero of x cube + k x square + 2 x + 8 find x

Answer 1

Answer:

Step-by-step explanation:

x cube + kx square + 2 x +8= 0

5 is a zero of this equation

so  5^3 + k 5^2 + 2 X 5 + 8 = 0

125 + 25 k + 10 +8 =0

25 k + 143= 0

25 k = -143

k= -143/25

k = - 5.72