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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? 

 Oct 3, 2020
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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

 Oct 3, 2020

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