cara penyelesaiannya gimana yak ? terimakasih

4log 81. 3log 32
log 81/log 4 × log 32/ log 3
= log 3^4/log 2^2 × log 2^5/log 3
= 4.log 3 / 2. log 2 × 5.log 2/ log 3
= 4/2 × 5
= 10