# Chapter 4 - Polynomials - 4.7 Polynomials in Several Variables - 4.7 Exercise Set - Page 284: 30

$-2x^2-4xy+3y^2$

#### Work Step by Step

By combining like terms, the given expression, $3x^2+6xy+3y^2-5x^2-10xy ,$ simplifies to \begin{array}{l}\require{cancel} (3x^2-5x^2)+(6xy-10xy)+3y^2 \\\\= -2x^2-4xy+3y^2 .\end{array}

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