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r⁶⁻⁴ = 4
r² = 4
r = 2 atau r = - 2
.
u2 . u8 = 16
ar. ar⁷ = 16
a² r⁸ = 16
a² = 16/2⁸ = 2⁶ / 2⁸ = 1/4
a = 1/2 atau a = -1/2