polynomials am i doing it right?
posted by anonymous .
You're on the right track...
1. expand it and write it out when it is a subtraction:
= x^4+7x^3+7) -2x^4+4x^3-1
= -x^4 + 11 x^3 + 6
2. space out your terms to avoid losing some of them.
(3n^3 + n^2 -n -4)+(5n^3 -4n^2 + 11)
= 3n^3 + n^2 -n -4 + 5n^3 -4n^2 + 11
= 8n^3 - 3n^2 -n + 7
for #1 i did
so why is it wrong?
because you see that when you expanded the polynomials after the -2x^4 yu have a - instead of a positive because recall that when the brackets expand - and - = +.
That is the only thing you did wrong.
Good luck! you are on the right track though.
ok thank you