Question

F(x)=ax^2 + b.g(x)=cx+d (F+g)(0)=12 (f-g)(0)=-4.(Fg)(-1)=26.

Answer 1

（F+g）(x)=ax^2+cx+b+d; (F-g)(x)=ax^2-cx+b-d; 再把(F+g)(0)=12和(F-g)(0)=-4带入,得b=4,d=8

同理把后两个表示出来再代入,求出a,c