Question

Solve log4 (y – 9) + log4 3 = log4 81

Answer 1

have you tried anything at all ? :)

Answer 2

... ok, assuming we have:
\[\LARGE \log_4(y-9)+\log_4(3)=\log_4(81 )\]
so..
\[\LARGE \log_4[(y-9)\cdot 3]=\log_4(81 )\]
from here we take logs off ...
and
\[\LARGE (y-9)\cdot 3=81 \]
\[\LARGE 3y-9\cdot 3=81 \]
can you do it now ? :)

Answer 3

@Stephanizer