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受欢迎的代数 >

-x^2-x+4=0

解答

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

解答

x = - \frac{1 + 17}{2}, x = \frac{17 - 1}{2}

+1

十进制

x = - 2.56155 \dots, x = 1.56155 \dots

求解步骤

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

使用求根公式求解

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

(- 1)^{2} - 4 (- 1) \cdot 4 = 17

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

将解分隔开

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

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

x = \frac{- ( - 1 ) - 17}{2 ( - 1 )} : \frac{17 - 1}{2}

二次方程组的解是:

x = - \frac{1 + 17}{2}, x = \frac{17 - 1}{2}

作图

流行的例子

7 (t - 3) > 4 (t - 8)

因式分解 v^2+10v+25

f a c t or v^{2} + 10 v + 25

因式分解 1/2 \sqrt[3]{128}

f a c t or \frac{1}{2} 3128

化简 0.554*(145.8)/(178.5)

s im pl i f y 0.554 \cdot \frac{145.8}{178.5}

∣ 5 x - 9 ∣ = ∣ 4 x + 8 ∣