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受欢迎的代数 >

5x^3=45x

解答

5 x^{3} = 45 x

解答

x = 0, x = - 3, x = 3

求解步骤

5 x^{3} = 45 x

将

45 x

para o lado esquerdo

5 x^{3} - 45 x = 0

因式分解

5 x^{3} - 45 x : 5 x (x + 3) (x - 3)

5 x (x + 3) (x - 3) = 0

使用零因数法则： If

ab = 0

then

a = 0

or

b = 0

x = 0 or x + 3 = 0 or x - 3 = 0

解

x + 3 = 0 : x = - 3

解

x - 3 = 0 : x = 3

解为

x = 0, x = - 3, x = 3

作图

流行的例子

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