The formula to convert exponentials to logarithmic form is:
[tex]\begin{gathered} y=a^x \\ \text{can be written as} \\ \log _ay=x \end{gathered}[/tex]So, matching this to the formula, we get:
[tex]\begin{gathered} 7^2=49 \\ or \\ 49=7^2 \\ \text{can be written as} \\ \log _749=2 \end{gathered}[/tex]Final Answer:
[tex]\log _749=2[/tex]