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受欢迎的代数 >

(4-x)(-5-x)+18=0

解答

(4 - x) (- 5 - x) + 18 = 0

解答

x = 1, x = - 2

求解步骤

(4 - x) (- 5 - x) + 18 = 0

展开

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

x^{2} + x - 2 = 0

使用求根公式求解

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

1^{2} - 4 \cdot 1 \cdot (- 2) = 3

x_{1, 2} = \frac{- 1 \pm 3}{2 \cdot 1}

将解分隔开

x_{1} = \frac{- 1 + 3}{2 \cdot 1}, x_{2} = \frac{- 1 - 3}{2 \cdot 1}

x = \frac{- 1 + 3}{2 \cdot 1} : 1

x = \frac{- 1 - 3}{2 \cdot 1} : - 2

二次方程组的解是:

x = 1, x = - 2

作图

流行的例子

3 x^{2} - 5 (x - 4) = 15

x^{2} = x - \frac{1}{4}

2 x (x + 1) = 5 x - 1

solvefor x,f=(4+k)x^2-3x+6

so l v e f or x, f = (4 + k) x^{2} - 3 x + 6

\frac{70 - 2 x ^{2}}{4} = 5