Question

第14题怎么做？

若以下回答无法解决问题，邀请你更新回答

Answer 1

(x^2+2x+3)(ax+b)
=ax^3+2ax^2+3ax +bx^2+2bx+3b
=ax^3+(2a+b)x^2+(3a+2b)x +3b
2a+b=1 (1)
3a+2b=0 (2)
2(1)-(2)
a=2
from (1)
2a+b=1
4+b=1
b=-3
(a,b)=(2,-3)