10.) 2 Log 8 + 2 log 32-2 log 16

2 log 8 + 2 log 32 - 2log 16 = 0
2 log ( 8 * 32 / 16 ) = 0
2 log 16 = 0
2 log 16 = === 2 log 2^4 = 4 .......................