(Q41).Using log
a
x
n
= nlog
a
x, expand log 5
23
Note: log x = log
10
x
log 5
23
log
10
5
23
log
10
5
written as per the given formula
23log
10
5 = 23
log5
log
23 log
10
5 = 23
log5
log(5×
)
23
log5
log(5×2)
= 23
log5
log5 + log
So it is
23
log5
log5 + log
Clear