Пожалуйста решение скажите

1) $5^{2}$ =25
x-4=25
x=29
2) $2^{2}$ =4
1-3x=4
-3x=3
x=-1
3) $4^{2}$ =16
25- $x^{2}$ =16
$x^{2} =9 \\ x=3$
4) $1^{2} =1 \\ 6x-1=1 \\ 6x=2 \\ x= \frac{1}{3}$
5) $4^{2} =16 \\ 25- x^{2} =16 \\ x^{2} =9 \\ x=3$
6) $12^{2} =144 \\ x^{2} -81=144 \\ x^{2} =225 \\ x=15$
7) $12^{2} =144 \\ x^{2} -256=144 \\ x^{2} =400 \\ x=20$
8) $15^{2} =225 \\ 625- x^{2} =225 \\ x^{2} =400 \\ x=20$