-8^5-1408x-512x^3+104x^4+640+1216x^ 2

104x^4-512x^3+1216^2-1408x-32128

I didn’t feel like typing all my work, so basically all you have to do is combine like terms. I hope this helped!

For a 0.25 pfor b o.3pp (0.25+0.3)=0.28