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受欢迎的代数 >

-2x^2-6x=-3

解答

- 2 x^{2} - 6 x = - 3

解答

x = - \frac{3 + 15}{2}, x = \frac{15 - 3}{2}

+1

十进制

x = - 3.43649 \dots, x = 0.43649 \dots

求解步骤

- 2 x^{2} - 6 x = - 3

将

3

para o lado esquerdo

- 2 x^{2} - 6 x + 3 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 6 ) \pm ( - 6 ) ^{2} - 4 ( - 2 ) \cdot 3}{2 ( - 2 )}

(- 6)^{2} - 4 (- 2) \cdot 3 = 215

x_{1, 2} = \frac{- ( - 6 ) \pm 2 15}{2 ( - 2 )}

将解分隔开

x_{1} = \frac{- ( - 6 ) + 2 15}{2 ( - 2 )}, x_{2} = \frac{- ( - 6 ) - 2 15}{2 ( - 2 )}

x = \frac{- ( - 6 ) + 2 15}{2 ( - 2 )} : - \frac{3 + 15}{2}

x = \frac{- ( - 6 ) - 2 15}{2 ( - 2 )} : \frac{15 - 3}{2}

二次方程组的解是:

x = - \frac{3 + 15}{2}, x = \frac{15 - 3}{2}

作图

流行的例子

因式分解 36s^2-4t^2

f a c t or 36 s^{2} - 4 t^{2}

- 2 (x - 8)^{2} > 24

5 m^{2} - 3 m = 7

∣ 9 x + 10 ∣ = ∣ x - 13 ∣

因式分解 4u^3+5u^2+12u+15

f a c t or 4 u^{3} + 5 u^{2} + 12 u + 15