Question

add the following 7x^2 +12xy-4y^2-4xy+2y^2-4x^2​

Answer 1

Step-by-step explanation:

$7x^{2} +12xy-4y^{2}-4xy+2y^{2}-4x^{2} \\7x^{2} -4x^{2} -4y^{2} +2y^{2} +12xy-4xy\\3x^{2} -2y^{2}+8xy$