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受欢迎的代数 >

x^2+16x+5=9

解答

x^{2} + 16 x + 5 = 9

解答

x = 2 (17 - 4), x = - 2 (4 + 17)

+1

十进制

x = 0.24621 \dots, x = - 16.24621 \dots

求解步骤

x^{2} + 16 x + 5 = 9

将

9

para o lado esquerdo

x^{2} + 16 x - 4 = 0

使用求根公式求解

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

1 6^{2} - 4 \cdot 1 \cdot (- 4) = 417

x_{1, 2} = \frac{- 16 \pm 4 17}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 16 + 4 17}{2 \cdot 1}, x_{2} = \frac{- 16 - 4 17}{2 \cdot 1}

x = \frac{- 16 + 4 17}{2 \cdot 1} : 2 (17 - 4)

x = \frac{- 16 - 4 17}{2 \cdot 1} : - 2 (4 + 17)

二次方程组的解是:

x = 2 (17 - 4), x = - 2 (4 + 17)

作图

流行的例子

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- 2.5 x^{2} + 0.9 = 0