Решите уравнения 2(x-2)(x+2)-(x-1)^2=x^2 -5 7 класс

Question

Решите уравнения
2(x-2)(x+2)-(x-1)^2=x^2 -5
7 класс

Answer 1

2(х^2-4)-(x^2-2x+1)=x^2-5
2x^2-8-x^2+2x-1=x^2-5
2x^2-x^2-x^2+2x=-5+1+8
2x=4
x=2

Answer 2

2x^2 - x - 1 = x^2 - 5x + 1 + x^2
2x^2 - x- 1 = 2x^2 - 5x + 1
- x - 1 = - 5x + 1
- x + 5x = 2
4x = 2
x = 2/4 = 1/2 = 0.5