[tex]36 - {x}^{2} = 0 \\ (6 - x)(6 + x) = 0 \\ [/tex]

6 - x = 0;. 6 + x = 0

x = -6

x = 6

[tex] {x}^{2} - 12x + 36 = 0 \\ {(x - 6)}^{2} = 0 \\ x - 6 = 0 \\ x = 6[/tex]

[tex]x + 6 = 0 \\ x = - 6[/tex]

[tex] {x}^{2} + x = 0 \\ x(x + 1) = 0 \\ x = 0 \\ x + 1 = 0 \\ x = - 1[/tex]

1 - Г

2 - А

3 - Д

4 - Б