Question

Solve x^2-8x=20 by completing the square. Which is the solition set of the equation ? A){-22, 14} B){-14, 22} C){-10, 2} D){-2, 10}

Answer 1

Its D. (-2 , 10)

Explanation:

x^2 - 8x = 20

(x - 4)^2 - 16 = 20

(x - 4)^2 = 36

x - 4 = +/- 6

x = 6 + 4 or - 6 + 4

so x = -2, 10.

Hope this helps.