Write an equation to describe the sequence below. Use n to represent the position of a term in the sequence, where n=1 for the first term. 3,12,48,…Write your answer using decimals and integers.an=____(____)n−1
Q. Write an equation to describe the sequence below. Use n to represent the position of a term in the sequence, where n=1 for the first term. 3,12,48,…Write your answer using decimals and integers.an=____(____)n−1
Identify type of sequence: Identify the type of sequence.We have the sequence: 3,12,48,…To determine if the sequence is arithmetic or geometric, we look at the relationship between consecutive terms.3 to 12 is a multiplication by 4, and 12 to 48 is also a multiplication by 4.Since each term is multiplied by a common ratio to get the next term, the sequence is geometric.
Determine first term and ratio: Determine the first term (a1) and the common ratio (r).The first term of the sequence is a1=3.To find the common ratio, we divide the second term by the first term: r=312=4.
Write formula for nth term: Write the formula for the nth term of a geometric sequence.The nth term of a geometric sequence is given by the formula an=a1⋅r(n−1).
Substitute values into formula: Substitute the values of a1 and r into the formula.We have a1=3 and r=4.Substituting these values into the formula gives us an=3×4(n−1).
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