Answer:
36
Step-by-step explanation:
a1 = 4
an=an-1 *3
a2 = a1 *3 = 4*3 = 12
a3 = a2*3 = 12*3 = 36
The solution for x in this equation is <em>18</em>.<em> </em>
x=2
you can see explanation as attached file
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