(4x - 5)²=(x + 5)²

4x-5=x+5

4x-x=5+5

3x=10

x=10/3

раскроем скобки

16x2-20x-20x+25 = x2+5x+5x+25

15x2-50x = 0

5x(3x – 10) = 0

x(3x – 10) = 0

x1 = 0

3x – 10 = 0

x2 = 10/3

Ответ :  

x1 = 0

x2 = 10/3