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受欢迎的代数 >

x^2+6x+9=(6x)/(0.42)

解答

x^{2} + 6 x + 9 = \frac{6 x}{0.42}

解答

x = \frac{3.48 + 5.76}{0.84}, x = \frac{3.48 - 5.76}{0.84}

+1

十进制

x = 7, x = 1.28571 \dots

求解步骤

x^{2} + 6 x + 9 = \frac{6 x}{0.42}

在两边乘以

0.42

0.42 x^{2} + 2.52 x + 3.78 = 6 x

将

6 x

para o lado esquerdo

0.42 x^{2} - 3.48 x + 3.78 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 3.48 ) \pm ( - 3.48 ) ^{2} - 4 \cdot 0.42 \cdot 3.78}{2 \cdot 0.42}

(- 3.48)^{2} - 4 \cdot 0.42 \cdot 3.78 = 5.76

x_{1, 2} = \frac{- ( - 3.48 ) \pm 5.76}{2 \cdot 0.42}

将解分隔开

x_{1} = \frac{- ( - 3.48 ) + 5.76}{2 \cdot 0.42}, x_{2} = \frac{- ( - 3.48 ) - 5.76}{2 \cdot 0.42}

x = \frac{- ( - 3.48 ) + 5.76}{2 \cdot 0.42} : \frac{3.48 + 5.76}{0.84}

x = \frac{- ( - 3.48 ) - 5.76}{2 \cdot 0.42} : \frac{3.48 - 5.76}{0.84}

二次方程组的解是:

x = \frac{3.48 + 5.76}{0.84}, x = \frac{3.48 - 5.76}{0.84}

作图

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