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Решите задачу:

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