\[c = 12:\ \ \ \ \ \ \]
\[\ \sqrt{37 + 12} = \sqrt{49} = 7.\]
\[c = - 1:\]
\[\sqrt{37 - 1} = \sqrt{36} = 6.\]
\[c = 27:\]
\[\sqrt{37 + 27} = \sqrt{64} = 8.\]
\[c = - 28:\]
\[\sqrt{37 - 28} = \sqrt{9} = 3.\]
\[c = 63:\]
\[\sqrt{37 + 63} = \sqrt{100} = 10.\]