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受欢迎的代数 >

k(k+4)-(k+4)=0

解答

k (k + 4) - (k + 4) = 0

解答

k = 1, k = - 4

求解步骤

k (k + 4) - (k + 4) = 0

展开

k (k + 4) - (k + 4) : k^{2} + 3 k - 4

k^{2} + 3 k - 4 = 0

使用求根公式求解

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

3^{2} - 4 \cdot 1 \cdot (- 4) = 5

k_{1, 2} = \frac{- 3 \pm 5}{2 \cdot 1}

将解分隔开

k_{1} = \frac{- 3 + 5}{2 \cdot 1}, k_{2} = \frac{- 3 - 5}{2 \cdot 1}

k = \frac{- 3 + 5}{2 \cdot 1} : 1

k = \frac{- 3 - 5}{2 \cdot 1} : - 4

二次方程组的解是:

k = 1, k = - 4

作图

流行的例子

0 = 12 x^{2} - 42 x + 36

16 x^{2} + 24 x = - 9

solvefor x,-x^2y+4xy+21y-4=0

so l v e f or x, - x^{2} y + 4 x y + 21 y - 4 = 0

2 x^{2} = 4 - 7 x

k = h + x^{2}