(Х-5)^2=5х^2-(2х-1)(2х+1)

Question

(Х-5)^2=5х^2-(2х-1)(2х+1)

Answer 1

X^2  - 10x + 25 = 5x^2 - (4x^2 - 1)
x^2 - 10x + 25 = 5x^2 - 4x^2 + 1
x^2 - 10x + 25 = x^2 + 1
x^2 - 10x + 25 - x^2  - 1 = 0 
- 10x + 25 - 1 = 0 
- 10x + 24 = 0 
- 10x = - 24
10x = 24
x = 2,4