Cuadrados Perfectos

\[x^2 = 4\]
\[x=\boxed{-2, 2}\]

\[x^2 = 49\]
\[x=\boxed{-7, 7}\]

\[x^2 = 25\]
\[x=\boxed{-5, 5}\]

\[x^2 = \frac{1}{4}\]
\[x=\boxed{\frac{-1}{2}, \frac{1}{2}}\]

\[x^2 = \frac{1}{81}\]
\[x=\boxed{\frac{-1}{9}, \frac{1}{9}}\]

\[x^2 = 9\]
\[x=\boxed{-3, 3}\]

\[x^2 + 1 = 17\]
\[x=\boxed{-4, 4}\]

\[x^2 + 1 = \frac{97}{16}\]
\[x=\boxed{\frac{-9}{4}, \frac{9}{4}}\]

\[x^2 + 1 = \frac{85}{4}\]
\[x=\boxed{\frac{-9}{2}, \frac{9}{2}}\]

\[2(x^2 + 1) = \frac{85}{2}\]
\[x=\boxed{\frac{-9}{2}, \frac{9}{2}}\]

\[4(x^2 + 1) = 29\]
\[x=\boxed{\frac{-5}{2}, \frac{5}{2}}\]

\[4(x^2 + 1) = 104\]
\[x=\boxed{-5, 5}\]