Solve for the variable, making sure to get an answer that is further out (3 or more decimal places) than the hundredths place (2 decimal places), then round the answer to the nearest hundredth.
As far as the actual math problem ( 4^x+2 = 15^3x-1 ), the problem is unclear.
Do you mean (4^x) + 2 = (15^3x) - 1 ?
Or do you mean 4^(x+2) = 15^(3x-1) ?
Or maybe (4^x) + 2 = (15^3)x - 1 ?