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受欢迎的代数 >

completesquare 3x^2+6x=0

解答

3 x^{2} + 6 x = 0

解答

x = 0, x = - 2

求解步骤

3 x^{2} + 6 x = 0

两边除以

3

\frac{3 x ^{2} + 6 x}{3} = \frac{0}{3}

x^{2} + 2 x = 0

改写为形式

(x + a)^{2} = b

(x + 1)^{2} = 1

若

f^{2} (x) = a

，解为

f (x) = a, - a

解

x + 1 = 1 : x = 0

解

x + 1 = - 1 : x = - 2

二次方程组的解是:

x = 0, x = - 2

作图

流行的例子

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co m pl e t es q u a re x^{2} - 9 x + 2 = 0

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18 x^{2} - 72 x - 378 = 0

12 x^{2} - 80 x + 96 = 0

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