Answer
Appendix A - Ex. Set : 33 (Answer)
$(-19y^2 +7yx + 7) - (y^2 + 4yx + 7)$
$= - 20y^2 + 3yx$
Work Step by Step
Appendix A - Ex. Set : 33 (Solution)
$(-19y^2 +7yx + 7) - (y^2 + 4yx + 7)$
$= - 19y^2 - y^2 + 7yx- 4yx + 7 - 7$ (Change signs and group like terms)
$= - 20y^2 + 3yx$ (Combine like terms)