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受欢迎的代数 >

a=x^2+16x-5

解答

a = x^{2} + 16 x - 5

解答

x = - 8 + a + 69, x = - a + 69 - 8

求解步骤

a = x^{2} + 16 x - 5

交换两边

x^{2} + 16 x - 5 = a

将

a

para o lado esquerdo

x^{2} + 16 x - 5 - a = 0

使用求根公式求解

x_{1, 2} = \frac{- 16 \pm 1 6 ^{2} - 4 \cdot 1 \cdot ( - 5 - a )}{2 \cdot 1}

化简

1 6^{2} - 4 \cdot 1 \cdot (- 5 - a) : 2 a + 69

x_{1, 2} = \frac{- 16 \pm 2 a + 69}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 16 + 2 a + 69}{2 \cdot 1}, x_{2} = \frac{- 16 - 2 a + 69}{2 \cdot 1}

x = \frac{- 16 + 2 a + 69}{2 \cdot 1} : - 8 + a + 69

x = \frac{- 16 - 2 a + 69}{2 \cdot 1} : - a + 69 - 8

二次方程组的解是:

x = - 8 + a + 69, x = - a + 69 - 8

作图

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