how to solve fibonacci using binet's simplified formula if you are looking for greater nth term?
how did they get the x10^18 to the answer of 90th term. the answer is 2.88 x 10^18
my question is how did they get the x 10^18?
Here is Binet's Formuls for finding the nth Fibonacci number:
F(90) = ((1/2 (1 + sqrt(5)))^90 - (1/2 (1 - sqrt(5)))^90)/sqrt(5)
= 2.880067194370816120 = 2.88 x 10^18
