Question

find the roots of x^2 - 4 x - 8 = 0 by the method of completing square​

Answer 1

Answer:

x^2 - 2×x×2 + 2^2 -8 = 2^2

(x -2)^2 = 4 + 8

(x-2)^2 = 12

x-2 = root12

x = root12 + 2

= 2root2 + 2

= 2 (root2+1)