Chapter 5 - Section 5.1 - Introduction to Polynomials and Polynomial Functions - Exercise Set - Page 325: 37

$-9x^4y^2-6x^2y^2+2xy-5x^2y$

Consider the given polynomial $(9x^4y^2-6x^2y^2+3xy)+(-18x^4y^2-5x^2y-xy)$ Need to drop the parentheses. Thus, $(9x^4y^2-6x^2y^2+3xy)+(-18x^4y^2-5x^2y-xy)=9x^4y^2-6x^2y+3xy-18x^4y^2-5x^2y-xy$ or, $=9x^4y^2-18x^4y^2-6x^2y^2-5x^2y+3xy-xy$ or, $=-9x^4y^2-6x^2y^2+2xy-5x^2y$