Subtract the lower exponent from the higher one. (4 from 8)
8 - 4 = 4
The base stays the same, so a = 3, and the exponent is now 4, so b = 4.
Now find 3^4 by multiplying.
3 × 3 × 3 × 3 = 81
a = 3
b = 4
c = 81
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