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受欢迎的代数 >

-x^3+19x-30=0

解答

- x^{3} + 19 x - 30 = 0

解答

x = 2, x = 3, x = - 5

求解步骤

- x^{3} + 19 x - 30 = 0

因式分解

- x^{3} + 19 x - 30 : - (x - 2) (x - 3) (x + 5)

- (x - 2) (x - 3) (x + 5) = 0

使用零因数法则： If

ab = 0

then

a = 0

or

b = 0

x - 2 = 0 or x - 3 = 0 or x + 5 = 0

解

x - 2 = 0 : x = 2

解

x - 3 = 0 : x = 3

解

x + 5 = 0 : x = - 5

解为

x = 2, x = 3, x = - 5

作图

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