[tex]5a^{2} -44=81\\5a^{2} -44+44=81+44\\5a^{2} =125\\\frac{5a^{2} }{5} = \frac{125}{5} \\a^{2} =25\sqrt{a^{2} } = \sqrt{25} \\a=5\\{5,-5}[/tex]
Hope this helps!!!