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受欢迎的代数 >

-5x^2+10x+8=7x^2+7x+5

解答

- 5 x^{2} + 10 x + 8 = 7 x^{2} + 7 x + 5

解答

x = - \frac{- 1 + 17}{8}, x = \frac{1 + 17}{8}

+1

十进制

x = - 0.39038 \dots, x = 0.64038 \dots

求解步骤

- 5 x^{2} + 10 x + 8 = 7 x^{2} + 7 x + 5

将

5

para o lado esquerdo

- 5 x^{2} + 10 x + 3 = 7 x^{2} + 7 x

将

7 x

para o lado esquerdo

- 5 x^{2} + 3 x + 3 = 7 x^{2}

将

7 x^{2}

para o lado esquerdo

- 12 x^{2} + 3 x + 3 = 0

使用求根公式求解

x_{1, 2} = \frac{- 3 \pm 3 ^{2} - 4 ( - 12 ) \cdot 3}{2 ( - 12 )}

3^{2} - 4 (- 12) \cdot 3 = 317

x_{1, 2} = \frac{- 3 \pm 3 17}{2 ( - 12 )}

将解分隔开

x_{1} = \frac{- 3 + 3 17}{2 ( - 12 )}, x_{2} = \frac{- 3 - 3 17}{2 ( - 12 )}

x = \frac{- 3 + 3 17}{2 ( - 12 )} : - \frac{- 1 + 17}{8}

x = \frac{- 3 - 3 17}{2 ( - 12 )} : \frac{1 + 17}{8}

二次方程组的解是:

x = - \frac{- 1 + 17}{8}, x = \frac{1 + 17}{8}

作图

流行的例子

solvefor m,h=m(10)+((1+m^2)/(40))*100

so l v e f or m, h = m (10) + (\frac{1 + m ^{2}}{40}) \cdot 100

x^{2} + 4 x + 12 = 9

7 x^{2} + 5 x + 1 = 0

72 t^{2} - 12 t - 24 = 0

x^{2} + 10 + 16 = 0