Question

sendo log 2 na base a = 20 e Log 5 na base a = 30 , determine o valor de Log 400 na base a

Answer 1

log400=
log 4.100 =
log 4 + log 100=
log2+log2   + log20.5=
20+20 + log20 + log5=
40 + log4.5 +30=
70+ log 4 + log 5=
70 + log2+log2  +30+
100 + 20 +20=
140