r = U2/U1r = 2√2 / -2r = -√2U1 = a = -2|Un = -2. (-√2)^{n-1}
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r = U2/U1
r = 2√2 / -2
r = -√2
U1 = a = -2
|
Un = -2. (-√2)^{n-1}