簡約 2(x-1)(x+1)-(2x-1)(x+1)

解

簡約

2 (x - 1) (x + 1) - (2 x - 1) (x + 1)

- x - 1

解答ステップ

2 (x - 1) (x + 1) - (2 x - 1) (x + 1)

拡張

2 (x - 1) (x + 1) : 2 x^{2} - 2

= 2 x^{2} - 2 - (2 x - 1) (x + 1)

拡張

- (2 x - 1) (x + 1) : - 2 x^{2} - x + 1

= 2 x^{2} - 2 - 2 x^{2} - x + 1

条件のようなグループ

= 2 x^{2} - 2 x^{2} - x - 2 + 1

類似した元を足す:

2 x^{2} - 2 x^{2} = 0

= - x - 2 + 1

数を足す:

- 2 + 1 = - 1

= - x - 1