# Chapter 5 - Section 5.4 - Adding and Subtracting Polynomials - Exercise Set: 61

6$x^{2}$ -2xy + 19$y^{2}$

#### Work Step by Step

( $x^{2}$ + 2xy - $y^{2}$ )+ ( 5$x^{2}$ -4xy + 20$y^{2}$ ) $x^{2}$ + 2xy - $y^{2}$ + 5$x^{2}$ -4xy + 20$y^{2}$ $x^{2}$ + 5$x^{2}$ + 2xy -4xy - $y^{2}$+ 20$y^{2}$ ) combine like terms 6$x^{2}$ -2xy + 19$y^{2}$ simplify

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