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 >

(2x-8)(2x+8)=55

解答

(2 x - 8) (2 x + 8) = 55

解答

x = \frac{119}{2}, x = - \frac{119}{2}

+1

十进制

x = 5.45435 \dots, x = - 5.45435 \dots

求解步骤

(2 x - 8) (2 x + 8) = 55

展开

(2 x - 8) (2 x + 8) : 4 x^{2} - 64

4 x^{2} - 64 = 55

将

55

para o lado esquerdo

4 x^{2} - 119 = 0

使用求根公式求解

x_{1, 2} = \frac{- 0 \pm 0 ^{2} - 4 \cdot 4 ( - 119 )}{2 \cdot 4}

0^{2} - 4 \cdot 4 (- 119) = 4119

x_{1, 2} = \frac{- 0 \pm 4 119}{2 \cdot 4}

将解分隔开

x_{1} = \frac{- 0 + 4 119}{2 \cdot 4}, x_{2} = \frac{- 0 - 4 119}{2 \cdot 4}

x = \frac{- 0 + 4 119}{2 \cdot 4} : \frac{119}{2}

x = \frac{- 0 - 4 119}{2 \cdot 4} : - \frac{119}{2}

二次方程组的解是:

x = \frac{119}{2}, x = - \frac{119}{2}

作图

流行的例子

因式分解 t^2+8t+16=0

f a c t or t^{2} + 8 t + 16 = 0

0=0.03q^2+35q-712

0 = 0.03 q^{2} + 35 q - 712

4 x^{2} - 250 = 0

9=-4.9t^2+17.4t+2

9 = - 4.9 t^{2} + 17.4 t + 2

0=-0.02x^2+x+2.6

0 = - 0.02 x^{2} + x + 2.6