ja

English

Español

Português

Français

Deutsch

Italiano

Русский

中文(简体)

한국어

日本語

Tiếng Việt

עברית

العربية

人気のある代数 >

2r^2-3r-4=0

解

2 r^{2} - 3 r - 4 = 0

解

r = \frac{3 + 41}{4}, r = \frac{3 - 41}{4}

+1

十進法表記

r = 2.35078 \dots, r = - 0.85078 \dots

解答ステップ

2 r^{2} - 3 r - 4 = 0

解くとthe二次式

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

(- 3)^{2} - 4 \cdot 2 (- 4) = 41

r_{1, 2} = \frac{- ( - 3 ) \pm 41}{2 \cdot 2}

解を分離する

r_{1} = \frac{- ( - 3 ) + 41}{2 \cdot 2}, r_{2} = \frac{- ( - 3 ) - 41}{2 \cdot 2}

r = \frac{- ( - 3 ) + 41}{2 \cdot 2} : \frac{3 + 41}{4}

r = \frac{- ( - 3 ) - 41}{2 \cdot 2} : \frac{3 - 41}{4}

二次equationの解:

r = \frac{3 + 41}{4}, r = \frac{3 - 41}{4}

グラフ

人気の例

2 x^{2} + 8 x - 16 = 0

(2x+1)(x-3)=(x+1)(x-2)

(2 x + 1) (x - 3) = (x + 1) (x - 2)

(x-7)^2+2x=(2x-1)(x-2)

(x - 7)^{2} + 2 x = (2 x - 1) (x - 2)

m^{2} - m - 30 = 0

x^{2} - 2 x + 19 = 0