(a + b)² = a² + 2ab + b²

(a - b)² = a² - 2ab + b²

a² - b² = (a - b)(a + b)

Решение:

(5a - 2)(5b + 2) = 5a*5b + 2 * 5a - 2*5b - 2*2 = 25ab + 10a + 10b - 4

(6x - 3)² = 36x² - 36x + 9

9b² - 36 = (3b - 6)(3b + 6)

(8m - 3)² - (8m - 1)(8m + 1) = (64m² - 48m + 9) - (64m² - 1) = 64m² - 48m + 9 - 64m² + 1 = -48m + 9 + 1 = -48m + 10