Question

What number should be added to both sides in order to solve x^2 -8x=0

Answer 1

16

Explanation:

x^2 -8x=0

rewrite in this form and add 16 to both sides:

x² + 2(- 4)x + 16 = 0 + 16

(x - 4)² = 16 ( take square root of both sides )

x - 4 = ± 4

x = 4 ± 4

x=8 , x= 0