1. 若x-3能整除-x^3+5x+k,則k的值為? 2. 若x+2能整除多項式x^3-3x^2+my+2,求m值為?

2017-08-02 7:40 pm

回答 (1)

2017-08-02 8:20 pm
✔ 最佳答案
1. 若x-3能整除-x^3+5x+k,則k的值為?
Sol
f(x)=-x^3+5x+k
x-3=0
x=3
f(3)=-27+15+k=0
k=12
2. 若x+2能整除多項式x^3-3x^2+mx+2.求m值為?
Sol
g(x)=x^3-3x^2+mx+2
x+2=0
x=-2
g(-2)=-8-12-2m+2=0
2m=-18
m=-9


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