Verified answer

1) y = x² - 2x

A(3 , 3)

3 = 3² - 2 * 3

3 = 9 - 6

3 = 3 - верно

B( - 1 ; 3)

3 = (- 1)² - 2 * (- 1)

3 = 1 + 2

3 = 3 - верно

C(5 ; 15)

15 = 5² - 2 * 5

15 = 25 - 10

15 = 15 - верно

Ответ : y = x² - 2x