Lara wants to solve the equation `x3 − x2 = 86` using an iterative method.
Lara's method was `x_(n+1) =sqrt(a/(x+b))` where `a` and `b` are integers.
Find the value of `a` and `b`.
Also find the value of `x_5` correct to `2` decimal places, given `x_1 = 5`.
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