Question

Решите уравнение:
x²-(x-4)(x+4)=4x.

Answer 1

x²-(x-4)(x+4)=4x
x²-(x²-4²)=4x
x²-x²+16=4x
16=4x
x=16:4
x=4

Answer 2

x² - ( x - 4)(x + 4) = 4x
x² - (x² - 16) = 4x
x² - x² + 16 = 4x
- 4x = - 16
4x = 16
x = 16/4
x = 4