Question

Упростите выражение:
(4x-3y)²-(2x+y) (3x-5y)

Answer 1

$(4x-3y)^2-(2x+y) (3x-5y)= \ =(4x)^2-2cdot4xcdot3y+(3y)^2-(6x^2-10xy+3xy-5y^2)= \ =16x^2-24xy+9y^2-6x^2+10xy-3xy+5y^2= \ =10x^2-17xy+14y^2$