## Introductory Algebra for College Students (7th Edition)

8y$^4$+2y$^2$+20
Distribute the negative sign to the parentheses and then combine like terms vertically. $\qquad3y^4-4y^2+7$ $\underline{-(-5y^4-6y^2-13)}$ $\qquad\qquad\downarrow$ $\quad3y^4-4y^2+7$ $\underline{+\,5y^4+6y^2+13}$ $\quad8y^4+2y^2+20$