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we have
[tex]9x^2-16y^2=144[/tex]Rewrite
[tex]\begin{gathered} \frac{9}{144}x^2-\frac{16}{144}y^2=\frac{144}{144} \\ \\ \frac{x^2}{16}-\frac{y^2}{9}=1 \\ \end{gathered}[/tex]where
a^2=16
a=4
b^2=9
b=3
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