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受欢迎的代数 >

x^2+14x-75=-3

解答

x^{2} + 14 x - 75 = - 3

解答

x = 4, x = - 18

求解步骤

x^{2} + 14 x - 75 = - 3

将

3

para o lado esquerdo

x^{2} + 14 x - 72 = 0

使用求根公式求解

x_{1, 2} = \frac{- 14 \pm 1 4 ^{2} - 4 \cdot 1 \cdot ( - 72 )}{2 \cdot 1}

1 4^{2} - 4 \cdot 1 \cdot (- 72) = 22

x_{1, 2} = \frac{- 14 \pm 22}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 14 + 22}{2 \cdot 1}, x_{2} = \frac{- 14 - 22}{2 \cdot 1}

x = \frac{- 14 + 22}{2 \cdot 1} : 4

x = \frac{- 14 - 22}{2 \cdot 1} : - 18

二次方程组的解是:

x = 4, x = - 18

作图

流行的例子

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