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受欢迎的代数 >

-x^3+30x^2-279x+810=0

解答

- x^{3} + 30 x^{2} - 279 x + 810 = 0

解答

x = 6, x = 9, x = 15

求解步骤

- x^{3} + 30 x^{2} - 279 x + 810 = 0

因式分解

- x^{3} + 30 x^{2} - 279 x + 810 : - (x - 6) (x - 9) (x - 15)

- (x - 6) (x - 9) (x - 15) = 0

使用零因数法则： If

ab = 0

then

a = 0

or

b = 0

x - 6 = 0 or x - 9 = 0 or x - 15 = 0

解

x - 6 = 0 : x = 6

解

x - 9 = 0 : x = 9

解

x - 15 = 0 : x = 15

解为

x = 6, x = 9, x = 15

作图

流行的例子

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