Define a sequence of functions f_{0}, f_{1}, f_{2}, ......, by
f_{0}(x)= 8, for all real x, and
f_{n+1}(x) = sqrt(x^{2} + 6f_{n}(x)); for all real x and all nonnegative integers n.
Solve the equation
f_{n}(x)= 2x


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