Question

Упростите выражение:     2х ( 2х + 3у) – (х + у)2 

Answer 1

2х(2х+3у)-(х+у)^2 = 4x^2+6xy-x^2-2xy-y^2 = 3x^2+4xy-y^2  

Answer 2

${4x}^{2} + 6xy - 2x - 2y$