Intermediate Algebra (6th Edition)

We are given the expression $(9y^{2}-3)+(-4y^{2}+1)-(5y^{2}-2)$. To subtract the third term from the first two, we can add the opposite of the third term. $(9y^{2}-3)+(-4y^{2}+1)+(-5y^{2}+2)$ Next, we can combine like terms. $(9y^{2}-4y^{2}-5y^{2})+(-3+1+2)=0$