4. Use the forward or backward substitution to find the solution of the given recurrence relation with the given initial conditions. Use appropriate summation formulas to simplify your answers if needed. an = an-1 + 2n-1, ao = 7

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Recurrence relation

A recurrence relation or recursive relation is an equation that represents a function in terms of the values of its smaller inputs. Every recurrence relation T(n) is a recursive function of integer n and consists of a base case and a recursive case.