Resumen

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

\[x^2 + 1 = \frac{13}{4}\]
\[x=\boxed{\frac{-3}{2}, \frac{3}{2}}\]

\[4(x^2 + 1) = 68\]
\[x=\boxed{-4, 4}\]

\[( x + 10 ) ( x - 4 ) = 0\]
\[x=\boxed{-10, 4}\]

\[( x + 8 ) ( x + 2 ) = 0\]
\[x=\boxed{-8, -2}\]

\[-3x^2 - 3x + 60=0\]
\[x = \boxed{(-5, 4)}\]