An algebra problem by tannistha mondal

Algebra Level pending

It is known that the set of all numbers of the form {(x^2) -􀀀 x + 20}/x , where 2 < x < 5, is equal to the set of all numbers z, where a ≤ z < b, and a < b are real numbers. Find (a + 1)^2 + b^2.

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