Introductory Algebra for College Students (7th Edition)

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