This article reviews a few different methods that Fibonacci could have used to find a real solution to the polynomial

[x^3 + 2x^2 + 10x = 20]


I will explain what the two most prominent methods are.

You can access the article via this link:

Fibonacci’s Forgotten Number Revisited
Richard Maruszewski
The College Mathematics Journal , Vol. 40, No. 4 (September 2009), pp. 248-251
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