Question 519405
(2x^2-5xy+y^2)+(-9x^2-4xy-y^2)+(x^2+xy-8y^2)
= 2x^2 - 5xy + y^2 - 9x^2 - 4xy - y^2 + x^2 + xy - 8y^2 {took out parentheses}
= -6x^2 - 8xy - 8y^2 {combined like terms}
<br>For more help from me, visit: <a href = "http://www.algebrahouse.com/" target = "_blank">www.algebrahouse.com</a><br><br><br>