8(3x+y)^2-12x(6x+4y)= 8(9x^2 + 6xy + y^2) - 72x^2 - 48xy = 72x^2 + 48xy +y^2 - 72x^2 - 48xy = y^2
8(3x+y)^2-12x(6x+4y)= 8(9x^2 + 6xy + y^2) - 72x^2 - 48xy = 72x^2 + 48xy +8y^2 - 72x^2 - 48xy =8 y^2 вроде всё)
8(3x+y)^2-12x(6x+4y)= 8(9x^2 + 6xy + y^2) - 72x^2 - 48xy = 72x^2 + 48xy +y^2 - 72x^2 - 48xy = y^2
8(3x+y)^2-12x(6x+4y)= 8(9x^2 + 6xy + y^2) - 72x^2 - 48xy = 72x^2 + 48xy +8y^2 - 72x^2 - 48xy =8 y^2 вроде всё)