Q. Write an explicit formula for an, the nth term of the sequence 6,2,−2,…Answer: an=
Find Common Difference: To find the explicit formula for the nth term of the sequence, we first need to determine the common difference by subtracting any term from the term that follows it.Subtract the second term 2 from the first term 6:6−2=4The common difference is −4 (since the sequence is decreasing).
Write Explicit Formula: Now that we have the common difference, we can write the explicit formula for the nth term of an arithmetic sequence: an=a1+(n−1)d where a1 is the first term and d is the common difference.
Substitute Values: Substitute the known values into the formula:a1=6 (the first term)d=−4 (the common difference)an=6+(n−1)(−4)
Simplify Formula: Simplify the formula:an=6−4(n−1)an=6−4n+4an=10−4nThis is the explicit formula for the nth term of the sequence.
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