Question 132145
{{{(4x^2-7xy+y^2)+(-8x^2-2xy-y^2)+(x^2+xy-7y^2)}}} Start with the given expression



{{{(y^2-y^2-7y^2)+(4x^2-8x^2+x^2)+(-7xy-2xy+xy)}}} Group like terms



{{{-7y^2-3x^2-8xy}}} Combine like terms