Find an explicit formula for the [[../02 Areas/Math/Fibonacci Sequence]] [[../02 Areas/Math/Sequence|Sequence]]. $ \begin{align} f_{n} = f_{n-1}, n \ge 2, f_{0}=0, f_{1} = 1 \end{align} $ $ \begin{align} r^2-r-1&=0\\ \end{align} $