We can note the following pattern:
[tex]\begin{gathered} 9^2+1+9=81+10=91 \\ 8^2+2+9=64+11=75 \end{gathered}[/tex]and
[tex]7^2+3+9=49+12=61[/tex]Similarly,
[tex]\begin{gathered} 6^2+4+9=36+13=49 \\ 5^2+5+9=25+14=39 \end{gathered}[/tex]So, our pattern matches with the given results.
By applying this pattern to the question, we have
[tex]3+7\Rightarrow3^2+7+9=9+16=25[/tex]Therefore, the answer is: 7+3=25
