Question

7 и 8 задание помогите решить

Answer 1

7) 79² - 21² = (79 - 21)(79 + 21) = 58 * 100 = 5800

8) (x - 5)² - 9 = (x - 5)² - 3² = (x - 5 - 3)(x - 5 + 3) = (x - 8)(x - 2)