Q. {f(1)=−62f(n)=f(n−1)+5Find an explicit formula for f(n).f(n)=
Identify sequence type: Identify the type of sequence described by the function f(n).Since f(n) is defined in terms of the previous term f(n−1) plus a constant, this indicates that the sequence is arithmetic.
Determine first term and common difference: Determine the first term and the common difference of the sequence.The first term is given as f(1)=−62. The common difference is the amount added to each term to get the next term, which is 5.
Use explicit formula for arithmetic sequence: Use the explicit formula for an arithmetic sequence to express f(n).The explicit formula for an arithmetic sequence is an=a1+(n−1)d, where a1 is the first term and d is the common difference.
Substitute values into formula: Substitute the values of a1 and d into the formula.Substituting the given values, we get f(n)=−62+(n−1)×5.
Simplify expression: Simplify the expression.Simplifying the expression, we get f(n)=−62+5n−5, which further simplifies to f(n)=5n−67.
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