Question

Помогите решить 2x(2x+3y)-(x+y)в квадрате

Answer 1

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

Answer 2

4х^2+6xy-x^2-x^2-2xy-y^=3x^2+4xy-y^2