2x(x+1)-x(x+5)=3(12-x)

解

2 x (x + 1) - x (x + 5) = 3 (12 - x)

x = 6, x = - 6

解答ステップ

2 x (x + 1) - x (x + 5) = 3 (12 - x)

拡張

2 x (x + 1) - x (x + 5) : x^{2} - 3 x

拡張

3 (12 - x) : 36 - 3 x

x^{2} - 3 x = 36 - 3 x

3 x

を左側に移動します

x^{2} = 36

x^{2} = f (a)

の場合, 解は

x = f (a), - f (a)

x = 36, x = - 36

36 = 6

- 36 = - 6

x = 6, x = - 6