Question

помогите срочно!!! ​

Answer 1

Ответ:

$1)(a + 7)^{2} = a ^{2} + 14a + 49 \\ 2)(3x - 4y)^{2} = 9x ^{2} - 21xy + 16y ^{2} \\ 3)(m - 6)(m + 6) = m ^{2} - 36 \\ 4)(5a + 8b)(8b - 5a) = 64b^{2} - 25a ^{2}$