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受欢迎的代数 >

(x-5)(4x+2)=-3

解答

(x - 5) (4 x + 2) = - 3

解答

x = \frac{9 + 109}{4}, x = \frac{9 - 109}{4}

+1

十进制

x = 4.86007 \dots, x = - 0.36007 \dots

求解步骤

(x - 5) (4 x + 2) = - 3

展开

(x - 5) (4 x + 2) : 4 x^{2} - 18 x - 10

4 x^{2} - 18 x - 10 = - 3

将

3

para o lado esquerdo

4 x^{2} - 18 x - 7 = 0

使用求根公式求解

x_{1, 2} = \frac{- ( - 18 ) \pm ( - 18 ) ^{2} - 4 \cdot 4 ( - 7 )}{2 \cdot 4}

(- 18)^{2} - 4 \cdot 4 (- 7) = 2109

x_{1, 2} = \frac{- ( - 18 ) \pm 2 109}{2 \cdot 4}

将解分隔开

x_{1} = \frac{- ( - 18 ) + 2 109}{2 \cdot 4}, x_{2} = \frac{- ( - 18 ) - 2 109}{2 \cdot 4}

x = \frac{- ( - 18 ) + 2 109}{2 \cdot 4} : \frac{9 + 109}{4}

x = \frac{- ( - 18 ) - 2 109}{2 \cdot 4} : \frac{9 - 109}{4}

二次方程组的解是:

x = \frac{9 + 109}{4}, x = \frac{9 - 109}{4}

作图

流行的例子

solvefor x,f=x^2+4y

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

0 = 8 - 2 x^{2}

0 = x^{2} + 2 x - 1

z^{2} = - 5

x^2+(x+1)^2=113

x^{2} + (x + 1)^{2} = 113