1 2sqrt x )) 5 1 2sqrt x )) 5 July 8, 2019 16 32 64 128 √ 5 1 + sqrt(5) / 2 2sqrt(x) =1 5 (sqrt(5) + 2) ^ (x - 1) = (sqrt(5) - 2) ^ ((x - 1)/(x + 1))