Найдите все корни уравнений:
1) \(\displaystyle c^2= 3 ^2\)
\(\displaystyle c_1=\)[ ], \(\displaystyle c_2=\)[ ]
2) \(\displaystyle z^2=\left(\frac{5}{17}\right)^2\)
\(\displaystyle z_1=\)[ ], \(\displaystyle z_2=\)[ ]