Q. Write an explicit formula that represents the sequence defined by the following recursive formula:a1=5 and an=an−1+3Answer: an=
Identify First Term: Identify the first term of the sequence.The first term is given as a1=5.
Determine Common Difference: Determine the common difference in the recursive formula.The recursive formula an=an−1+3 suggests that each term is 3 more than the previous term. This indicates a common difference of 3.
Write Explicit Formula: Write the explicit formula based on the first term and the common difference.The explicit formula for an arithmetic sequence is given by an=a1+(n−1)d, where a1 is the first term and d is the common difference.
Substitute Known Values: Substitute the known values into the explicit formula.Substituting a1=5 and d=3 into the formula, we get an=5+(n−1)⋅3.
Simplify Formula: Simplify the explicit formula.Simplifying the formula, we get an=5+3n−3.Combining like terms, we get an=3n+2.
More problems from Identify a sequence as explicit or recursive