Answer:
a = 15
Step-by-step explanation:
Perhaps your question is:
[tex] 4^{12}= 4^{a-3}[/tex]
If it is so then let us solve:
[tex] 4^{12}= 4^{a-3}[/tex]
Since, bases are equal hence exponents will also be equal. Therefore,
12 = a - 3
12 + 3 = a
a = 15
