Найдите все корни уравнений:

1)  \(\displaystyle c^2= 3 ^2\)

\(\displaystyle c_1=\)[ ],  \(\displaystyle c_2=\)[ ]

2)  \(\displaystyle z^2=\left(\frac{5}{17}\right)^2\)

\(\displaystyle z_1=\)[ ],  \(\displaystyle z_2=\)[ ]