Solve:

3 log 10^x = 4.2

the 10 is underneath the log

I got a weird number in scientific notation.

2.511... X 10^9

1 answer

not weird. Just the answer.

3 log x = 4.2
log x = 1.4
x = 10^1.4 = 25.1188

Not your answer. So, investigating your answer,

x = 2.511x10^9
since log(ab) = log a + log b,
log x = log 2.511 + log 10^9
log x = 0.4 + 9
log x = 9.4

Not sure what's going on here.