Question

$$(3x-2y) { x }^{ 2 } +xy+ { y }^{ 2 } -(x+y) { x }^{ 2 } -xy+ { y }^{ 2 }$$

Evaluate

$2x^{3}+2y^{2}-3yx^{2}$

Expand

$2x^{3}+2y^{2}-3yx^{2}$