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受欢迎的代数 >

x(13+x)+6=42

解答

x (13 + x) + 6 = 42

解答

x = \frac{- 13 + 313}{2}, x = \frac{- 13 - 313}{2}

+1

十进制

x = 2.34590 \dots, x = - 15.34590 \dots

求解步骤

x (13 + x) + 6 = 42

展开

x (13 + x) + 6 : 13 x + x^{2} + 6

13 x + x^{2} + 6 = 42

将

42

para o lado esquerdo

x^{2} + 13 x - 36 = 0

使用求根公式求解

x_{1, 2} = \frac{- 13 \pm 1 3 ^{2} - 4 \cdot 1 \cdot ( - 36 )}{2 \cdot 1}

1 3^{2} - 4 \cdot 1 \cdot (- 36) = 313

x_{1, 2} = \frac{- 13 \pm 313}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 13 + 313}{2 \cdot 1}, x_{2} = \frac{- 13 - 313}{2 \cdot 1}

x = \frac{- 13 + 313}{2 \cdot 1} : \frac{- 13 + 313}{2}

x = \frac{- 13 - 313}{2 \cdot 1} : \frac{- 13 - 313}{2}

二次方程组的解是:

x = \frac{- 13 + 313}{2}, x = \frac{- 13 - 313}{2}

作图

流行的例子

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