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受欢迎的代数 >

x^2+4x=98

解答

x^{2} + 4 x = 98

解答

x = - 2 + 102, x = - 2 - 102

+1

十进制

x = 8.09950 \dots, x = - 12.09950 \dots

求解步骤

x^{2} + 4 x = 98

将

98

para o lado esquerdo

x^{2} + 4 x - 98 = 0

使用求根公式求解

x_{1, 2} = \frac{- 4 \pm 4 ^{2} - 4 \cdot 1 \cdot ( - 98 )}{2 \cdot 1}

4^{2} - 4 \cdot 1 \cdot (- 98) = 2102

x_{1, 2} = \frac{- 4 \pm 2 102}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 4 + 2 102}{2 \cdot 1}, x_{2} = \frac{- 4 - 2 102}{2 \cdot 1}

x = \frac{- 4 + 2 102}{2 \cdot 1} : - 2 + 102

x = \frac{- 4 - 2 102}{2 \cdot 1} : - 2 - 102

二次方程组的解是:

x = - 2 + 102, x = - 2 - 102

作图

流行的例子

x^{2} + 21 = 142

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3 x^{2} = 2 - 5 x

4 x^{2} - 10 x - 4 = 0

n^{2} - 10 = 26