What is the answer for 1+1+7x 2 +7y 3 +3+2x 2 -y 3

First, a little housekeeping!

1+1+7x 2 +7y 3 +3+2x 2 -y 3 needs to be written as 1+1+7x ^2 +7y ^3 +3+2x ^2 -y ^3. The " ^ " signifies exponentiation and is essential here.

Now combine like terms:

7y^3-y^3 + 7x^2 + 2x^2 + 1 + 1 + 3

You'll get 6y^3 + 9x^2 + 5.