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 >

15x^2-28=x

解答

15 x^{2} - 28 = x

解答

x = \frac{7}{5}, x = - \frac{4}{3}

+1

十进制

x = 1.4, x = - 1.33333 \dots

求解步骤

15 x^{2} - 28 = x

将

x

para o lado esquerdo

15 x^{2} - 28 - x = 0

改写成标准形式

a x^{2} + b x + c = 0

15 x^{2} - x - 28 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 1 ) \pm ( - 1 ) ^{2} - 4 \cdot 15 ( - 28 )}{2 \cdot 15}

(- 1)^{2} - 4 \cdot 15 (- 28) = 41

x_{1, 2} = \frac{- ( - 1 ) \pm 41}{2 \cdot 15}

将解分隔开

x_{1} = \frac{- ( - 1 ) + 41}{2 \cdot 15}, x_{2} = \frac{- ( - 1 ) - 41}{2 \cdot 15}

x = \frac{- ( - 1 ) + 41}{2 \cdot 15} : \frac{7}{5}

x = \frac{- ( - 1 ) - 41}{2 \cdot 15} : - \frac{4}{3}

二次方程组的解是:

x = \frac{7}{5}, x = - \frac{4}{3}

作图

流行的例子

solvefor x,-8x^2+18y^2+18z^2=2

so l v e f or x, - 8 x^{2} + 18 y^{2} + 18 z^{2} = 2

solvefor t,h= 1/2*a_{g(t)}*t^2

so l v e f or t, h = \frac{1}{2} \cdot a_{g (t)} \cdot t^{2}

(7 x)^{2} - 49 = 0

2=0.013x^2-1.18x+28.24

2 = 0.013 x^{2} - 1.18 x + 28.24

(x - 6.25)^{2} = 3