1
7² - 3*7 - 28 = 0
49 - 21 - 28 = 0
0 = 0
верно
(-4)² - 3*(-4) - 28 = 0
16 + 12 - 28 = 0
0 = 0
верно
2
3*(-1)² - 3*(-1) - 6 = 0
3 + 3 - 6 = 0
0 = 0
верно
3*2² - 3*2 - 6 = 0
12 - 6 - 6 = 0
0 = 0
верно
3
3² - 9*3 + 18 = 0
9 - 27 + 18 = 0
0 = 0
верно
6² - 9*6 + 18 = 0
36 - 54 + 18 = 0
0 = 0
верно
4
(-2)² + 5*(-2) + 6 = 0
4 - 10 + 6 = 0
0 = 0
верно
(-3)² + 5*(-3) + 6 = 0
9 - 15 + 6 = 0
0 = 0
верно