Question 189598
{{{log5 ((3x)^4)}}}
{{{ln(3x)^4/ln(5))}}}
{{{ln((3x)^4 - 5))}}}
.

Now, if x = 7
{{{ln((21)^4 - 5))}}}
{{{ln((21)^4 - 5))}}}
12.1781