Question 604543
Since you have provided an "expresson" rather than an "equation", there is nothing to "solve"!
However, you could simplify the given expression:
{{{Log[9](x/y^4)^2}}} First, simplify the argument:
{{{Log[9](x^2/y^8)}}} Now apply the "quotient rule" for logarithms: {{{Log[b](M/N) = Log[b](M)-Log[b](N)}}} to get:
{{{Log[9](x^2)-Log[9](y^8)}}} Now apply the "power rule":
{{{2Log[9](x)-8Log[9](y)}}}