Question

已知函数f（x）=x+x+p,F（x）=f(f(x)).（1）若q=-2,试求F（x)的零点；求大神帮助

Answer 1

F(x)=f(f(x) =(x+x+p)+(x+x+p)+p = x^4+x^2+p^2+2x^3+2px+2px^2 +(x+x+p)+p = x^4+2x^3+(2p+2)x^2+(2p+1)x+p^2+2p q沒出現過,寫錯了吧?