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受欢迎的代数 >

-5x^2-9x+12=0

解答

- 5 x^{2} - 9 x + 12 = 0

解答

x = - \frac{9 + 321}{10}, x = \frac{321 - 9}{10}

+1

十进制

x = - 2.69164 \dots, x = 0.89164 \dots

求解步骤

- 5 x^{2} - 9 x + 12 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 9 ) \pm ( - 9 ) ^{2} - 4 ( - 5 ) \cdot 12}{2 ( - 5 )}

(- 9)^{2} - 4 (- 5) \cdot 12 = 321

x_{1, 2} = \frac{- ( - 9 ) \pm 321}{2 ( - 5 )}

将解分隔开

x_{1} = \frac{- ( - 9 ) + 321}{2 ( - 5 )}, x_{2} = \frac{- ( - 9 ) - 321}{2 ( - 5 )}

x = \frac{- ( - 9 ) + 321}{2 ( - 5 )} : - \frac{9 + 321}{10}

x = \frac{- ( - 9 ) - 321}{2 ( - 5 )} : \frac{321 - 9}{10}

二次方程组的解是:

x = - \frac{9 + 321}{10}, x = \frac{321 - 9}{10}

作图

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