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 >

2g^2-6g-9=0

解答

2 g^{2} - 6 g - 9 = 0

解答

g = \frac{3 ( 1 + 3 )}{2}, g = \frac{3 ( 1 - 3 )}{2}

+1

十进制

g = 4.09807 \dots, g = - 1.09807 \dots

求解步骤

2 g^{2} - 6 g - 9 = 0

使用求根公式求解

g_{1, 2} = \frac{- ( - 6 ) \pm ( - 6 ) ^{2} - 4 \cdot 2 ( - 9 )}{2 \cdot 2}

(- 6)^{2} - 4 \cdot 2 (- 9) = 63

g_{1, 2} = \frac{- ( - 6 ) \pm 6 3}{2 \cdot 2}

将解分隔开

g_{1} = \frac{- ( - 6 ) + 6 3}{2 \cdot 2}, g_{2} = \frac{- ( - 6 ) - 6 3}{2 \cdot 2}

g = \frac{- ( - 6 ) + 6 3}{2 \cdot 2} : \frac{3 ( 1 + 3 )}{2}

g = \frac{- ( - 6 ) - 6 3}{2 \cdot 2} : \frac{3 ( 1 - 3 )}{2}

二次方程组的解是:

g = \frac{3 ( 1 + 3 )}{2}, g = \frac{3 ( 1 - 3 )}{2}

作图

流行的例子

(2 k - 1)^{2} = - 27

solvefor y,x=4-y^2

so l v e f or y, x = 4 - y^{2}

0 = (x - 1) (x + 1)

16 = (x - 4) (x + 2)

t^{2} - 8 t - 20 = 0