Example 2 (Laws of Logarithms)

Example 2

Find the value of the following.
(a) log 2 7+ log 2 12 log 2 21

(b) 3 log 10 5+2 log 10 2 log 10 5

(c) 2 log 10 3 log 10 3+ log 10 3 1 3

(d) log 3 3p+ log 3 3q log 3 pq