Question

Даййтеее гтвет пжжжж срочно умоляю!!!! Тока можно без всяких ^

Answer 1

$(a + 2b)(a + 2b) - ( {a}^{2} - 4ba + 4 {b}^{2} ) = \\ = {a}^{2} + 4ba + 4 {b}^{2} - {a}^{2} + 4ba - 4 {b}^{2} = \\ = 8ba$

Answer 2

$(a + 2b) ^{2} - (a - 2b) ^{2} = (a + 2b + a - 2b) (a + 2b - (a - 2b)) = 2a (a + 2b - a + 2b) = 2a \times 4b = 8ab$