Explanation:
I think what you meant was
an = -4(3^n) - 1
so, this is not meant to be a^n ...
and so when looking for the 5th term it just means n = 5.
a5 = -4×3⁵ - 1 = -4×243 -1 = -972 - 1 = -973
so, B is correct.
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