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Verified answer
4,-12,36,-108a=4
r=-12/4=-3
U9=a×r^n-1
U9=4×(-3)^9-1
U9=4×(-3)^8
U9=4 × 6.561
U9=26.244
r = -3
U9 = 4.-3^8
= 4. 6561
= 26244