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

3x$^2$-7x+9
Distribute the negative sign to the parentheses and then combine like terms vertically. $\quad7x^2-9x+2$ $\underline{-(4x^2-2x-7)}$ $\qquad$$\quad$$\downarrow$ $\quad7x^2-9x+2$ $\underline{-4x^2+2x+7}$ $\quad3x^2-7x+9$