Verified Answer :

caylus

Hello,

f(x)=x²+9x
g(x)=(x+5)²

g(f(x))=g(x²+9x)=((x²+9x)+5)²=(x²+9x+5)²=x^4+81x²+25+2x²9x +2x²5 +29x5
=x^4+18x^3+91x²+90x+25