Solución 1
\[x^2 = 25\]
\[x=\boxed{-5, 5}\]
Solución 2
\[x^2 = 64\]
\[x=\boxed{-8, 8}\]
Solución 3
\[x^2 = 9\]
\[x=\boxed{-3, 3}\]
Solución 4
\[x^2 = \frac{81}{64}\]
\[x=\boxed{\frac{-9}{8}, \frac{9}{8}}\]
Solución 5
\[x^2 = \frac{9}{25}\]
\[x=\boxed{\frac{-3}{5}, \frac{3}{5}}\]
Solución 6
\[x^2 = \frac{16}{25}\]
\[x=\boxed{\frac{-4}{5}, \frac{4}{5}}\]
Solución 7
\[x^2 + 1 = 26\]
\[x=\boxed{-5, 5}\]
Solución 8
\[x^2 + 1 = \frac{53}{4}\]
\[x=\boxed{\frac{-7}{2}, \frac{7}{2}}\]
Solución 9
\[x^2 + 1 = \frac{85}{4}\]
\[x=\boxed{\frac{-9}{2}, \frac{9}{2}}\]
Solución 10
\[4(x^2 + 1) = 85\]
\[x=\boxed{\frac{-9}{2}, \frac{9}{2}}\]
Solución 11
\[5(x^2 + 1) = 85\]
\[x=\boxed{-4, 4}\]
Solución 12
\[4(x^2 + 1) = \frac{232}{9}\]
\[x=\boxed{\frac{-7}{3}, \frac{7}{3}}\]
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