Ответ:
(x-2y)(x+2y) + 2y(y+3) - x^2 = x^2 - 4y^2 + 2y^2 + 6y - x^2 = -2y^2 + 6y
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Ответ:
(x-2y)(x+2y) + 2y(y+3) - x^2 = x^2 - 4y^2 + 2y^2 + 6y - x^2 = -2y^2 + 6y