Chapter 5 - Polynomials and Factoring - 5.4 Factoring Perfect-Square Trinomials and Differences of Squares - 5.4 Exercise Set - Page 333: 95

$2x^3+x^2-2$

Removing the grouping symbols and then combining like terms, the given expression, $ (2x^3-x+3)+(x^2+x-5) ,$ simplifies to \begin{array}{l} 2x^3-x+3+x^2+x-5 \\\\= 2x^3+x^2+(-x+x)+(3-5) \\\\= 2x^3+x^2+0x-2 \\\\= 2x^3+x^2-2 \end{array}