Explanation:
f(-1) = (1/8)^-1 = 1/(1/8) = 8
f(0) = (1/8)⁰ = 1 (a⁰ = 1 for any a)
f(1) = (1/8)¹ = 1/8 = 0.125
f(2) = (1/8)² = 1/64 = 0.015625
f(3) = (1/8)³ = 1/512 = 0.001953125
remember
(a/b)ⁿ = aⁿ / bⁿ
in the same way as
(a×b)ⁿ = aⁿ×bⁿ
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