Chapter 5 - Section 5.1 - Introduction to Polynomials and Polynomial Functions - Exercise Set - Page 325: 52

$20a^2b^4-9ab^2+2ab$

Consider the given polynomial $(13a^2b^4-17ab^2+ab)-(-7a^2b^4-8ab^2-ab)$ Need to drop the parentheses. Thus, $(13a^2b^4-17ab^2+ab)-(-7a^2b^4-8ab^2-ab)=13a^2b^4-17ab^2+ab+7a^2b^4+8ab^2+ab$ or, $=13a^2b^4+7a^2b^4-17ab^2+8ab^2+ab+ab$ or, $=20a^2b^4-9ab^2+2ab$