bjr
log(a/b) = loga - logb
4)
log500 - log5 = log (500/5) = log100 = log 10² = 2log10 = 2
log30 + log700 - log21 = log(30 x 700) - log21
= log 21000/21
= log 1000
= log 10³
= 3log 10
= 3
5)
2^x = 5
log2^x = log5 [ logaⁿ = nloga ]
xlog2 = log5
x = log5 / log2
