zs

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

受欢迎的代数 >

y^2-8y-1=0

解答

y^{2} - 8 y - 1 = 0

解答

y = 4 + 17, y = 4 - 17

+1

十进制

y = 8.12310 \dots, y = - 0.12310 \dots

求解步骤

y^{2} - 8 y - 1 = 0

使用求根公式求解

y_{1, 2} = \frac{- ( - 8 ) \pm ( - 8 ) ^{2} - 4 \cdot 1 \cdot ( - 1 )}{2 \cdot 1}

(- 8)^{2} - 4 \cdot 1 \cdot (- 1) = 217

y_{1, 2} = \frac{- ( - 8 ) \pm 2 17}{2 \cdot 1}

将解分隔开

y_{1} = \frac{- ( - 8 ) + 2 17}{2 \cdot 1}, y_{2} = \frac{- ( - 8 ) - 2 17}{2 \cdot 1}

y = \frac{- ( - 8 ) + 2 17}{2 \cdot 1} : 4 + 17

y = \frac{- ( - 8 ) - 2 17}{2 \cdot 1} : 4 - 17

二次方程组的解是:

y = 4 + 17, y = 4 - 17

作图

流行的例子

x^{2} - 5 x + 27 = 21

-16t^2+16t+96=0

- 16 t^{2} + 16 t + 96 = 0

g(n)=-3n^2+7n+1

g (n) = - 3 n^{2} + 7 n + 1

solvefor x,f=(y-3x)^2

so l v e f or x, f = (y - 3 x)^{2}

t^{2} - 50 = 0