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受欢迎的代数 >

x^2+sqrt(5)x-19=0

解答

x^{2} + 5 x - 19 = 0

解答

x = \frac{- 5 + 9}{2}, x = \frac{- 5 - 9}{2}

+1

十进制

x = 3.38196 \dots, x = - 5.61803 \dots

求解步骤

x^{2} + 5 x - 19 = 0

使用求根公式求解

x_{1, 2} = \frac{- 5 \pm ( 5 ) ^{2} - 4 \cdot 1 \cdot ( - 19 )}{2 \cdot 1}

(5)^{2} - 4 \cdot 1 \cdot (- 19) = 9

x_{1, 2} = \frac{- 5 \pm 9}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 5 + 9}{2 \cdot 1}, x_{2} = \frac{- 5 - 9}{2 \cdot 1}

x = \frac{- 5 + 9}{2 \cdot 1} : \frac{- 5 + 9}{2}

x = \frac{- 5 - 9}{2 \cdot 1} : \frac{- 5 - 9}{2}

二次方程组的解是:

x = \frac{- 5 + 9}{2}, x = \frac{- 5 - 9}{2}

作图

流行的例子

- 2 (x - 4)^{2} + 50 = 0

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so l v e f or x, y^{2} = x^{2} + z^{2}

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3x^2-160x+1600=0

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