Solve for x.
log x + log 4x = 2
log (ab) = log a + log b
so log 4x = log 4 + log x
2 log x = 2 - log 4
log x = (2-log 4)/2
x = 10^[(2-log 4)/2]
log x + log 4x = 2
so log 4x = log 4 + log x
2 log x = 2 - log 4
log x = (2-log 4)/2
x = 10^[(2-log 4)/2]