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it is making use of the rule:\[a\times a^n=a^{n+1}\]

can you see how?

Not really. Could you put the equation into that rule? I think I'l be able to understand, then.

ok, first of all how can you simplify the left hand side of your expression?

e.g. a + a + a = ?

3(3^x), right?

correct

now apply the rule

a(a^n) = a^n+1
3(3^x) = 3^x+1
Aa.
If I may ask, how does the rule work/make sense?

e.g.:\[a\times a^3=a\times(a\times a\times a)=a\times a\times a\times a=a^4\]

and 4 = 3 + 1

the general rule here is:\[a^m\times a^n=a^{m+n}\]

yw :)