Question

Упростите выражение: 2х(2х+3y)-(x+y)^2

Answer 1

4x²+6xy-(x²+y²+2xy)=4x²+6xy-x²-y²-2xy=3x²+4xy-y²

Answer 2

$4x^{2} +6xy-( x^{2} +2xy+ y^{2} ) =0\\ 4x^{2} +6xy- x^{2} -2xy- y^{2}=0 \\ 3x^{2} +4xy - y^{2} =0$