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受欢迎的代数 >

56=x^2-x

解答

56 = x^{2} - x

解答

x = 8, x = - 7

求解步骤

56 = x^{2} - x

交换两边

x^{2} - x = 56

将

56

para o lado esquerdo

x^{2} - x - 56 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 1 ) \pm ( - 1 ) ^{2} - 4 \cdot 1 \cdot ( - 56 )}{2 \cdot 1}

(- 1)^{2} - 4 \cdot 1 \cdot (- 56) = 15

x_{1, 2} = \frac{- ( - 1 ) \pm 15}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- ( - 1 ) + 15}{2 \cdot 1}, x_{2} = \frac{- ( - 1 ) - 15}{2 \cdot 1}

x = \frac{- ( - 1 ) + 15}{2 \cdot 1} : 8

x = \frac{- ( - 1 ) - 15}{2 \cdot 1} : - 7

二次方程组的解是:

x = 8, x = - 7

作图

流行的例子

8 = x + 5

40<= 5/9 (F-32)<= 50

40 \leq \frac{5}{9} (F - 32) \leq 50

s im pl i f y \frac{5}{2} + 1

5/(x-3)> 3/(x+1)

\frac{5}{x - 3} > \frac{3}{x + 1}

s im pl i f y \frac{2}{3} + \frac{2}{7}