[tex]{a}^{2} + \frac{9}{a^{2} - 9} [/tex]

[tex] \frac {{a}^{4} + 9 - {9a}^{2} }{ {a}^{2} } [/tex]

[tex] \frac{ {a}^{4} - {9a}^{2} + 9 }{ {a}^{2} } [/tex]