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U3=8➡a×r^2=-8
suku ke 5=-32
U5=-32➡a×r^4=-32
a×r^4=-32
a×r^2=-8
dibagi
r^2=4
r=akar 4=2
a×r^2=-8
a×2^2=-8
a×4=-8
a=-8÷4=-2
a=-2 r=2
U7=a×r^6
U7=-2×2^6
U7=-2×64
U7=-128
suku ke 7 = -128
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