5.3 Equations Involving Indices (Example 5)

Example 5 (Unequal Base – put log both sides):
Solve each of the following.
(a) $3^{x+1}=7$
(b) $2(3^x)=5$
(c) $2^x{.3}^x=9^{x-4}$
(d) $5^{x-1}{.3}^{x+2}=10$