X^3-3x^2-16x-12=0
答案:4 悬赏:40 手机版
解决时间 2021-02-02 05:36
- 提问者网友：沦陷
- 2021-02-01 18:21
X^3-3x^2-16x-12=0
最佳答案
- 五星知识达人网友：低音帝王
- 2021-02-01 18:57
如图
全部回答
- 1楼网友：老鼠爱大米
- 2021-02-01 21:53
如图
- 2楼网友：动情书生
- 2021-02-01 21:19
f(x) =x^3-3x^2-16x-12
f(-2) =-8-12+32-12=0
x^3-3x^2-16x-12 = (x-2)(x^2+ax+6)
coef. of x
6-2a=-16
a=11
x^3-3x^2-16x-12=0
(x-2)(x^2+11x+6)=0
x=2
f(-2) =-8-12+32-12=0
x^3-3x^2-16x-12 = (x-2)(x^2+ax+6)
coef. of x
6-2a=-16
a=11
x^3-3x^2-16x-12=0
(x-2)(x^2+11x+6)=0
x=2
- 3楼网友：过活
- 2021-02-01 20:03
x³-3x²-16x-12=0
x³-6x²+3x²-18x+2x-12=0
x²(x-6)+3x(x-6)+2(x-6)=0
(x-6)(x²+3x+2)=0
(x-6)(x+1)(x+2)=0
x=6或x=-1或x=-2
x³-6x²+3x²-18x+2x-12=0
x²(x-6)+3x(x-6)+2(x-6)=0
(x-6)(x²+3x+2)=0
(x-6)(x+1)(x+2)=0
x=6或x=-1或x=-2
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