Question

помогите пожалуйста

Answer 1

$1) {(x - 2)}^{2} = {x}^{2} - 4x + 4 \ 2) (3m + 9n)^{2} = 9 {m}^{2} + 54mn + 81 {n}^{2} \ 3)(c + 8)(c - 8) = {c}^{2} - 64 \ 4)(2a + 5b)(5b - 2a) = 25 {b}^{2} - 4 {a}^{2}$
$1)100 - {a}^{2} = (10 + a)(10 - a) \ 2) {x}^{2} + 10x + 25 = (x + 5) ^{2} \ 3)36 {y}^{2} - 49 = (6y + 7)(6y - 7) \ 4)16 {a}^{2} - 24ab + 9 {b}^{2} = (4a - 3b) ^{2}$