4lg2+3lg5-lg1/5

4lg2+3lg5-lg1/5
4lg2+3lg5-lg1/5

4lg2+3lg5-lg1/5
4lg2+3lg5-lg1/5
=lg2^4+lg5^3-lg5^(-1)
=lg(2^4x5^3)/[5^(-1)]
=lg(2^4x5^4)
=lg(2x5)^4
=4lg10
=4