Q. {f(1)=37,f(n)=f(n−1)×0.3 Find an explicit formula for f(n).f(n)=
Given Sequence: We are given a recursive sequence where the first term is f(1)=37 and each subsequent term is found by multiplying the previous term by 0.3. To find an explicit formula for f(n), we need to express f(n) in terms of n without referencing previous terms.
Examining the Pattern: Let's examine the pattern of the sequence to find the explicit formula. We know that f(1)=37. According to the recursive formula, f(2) would be f(1)×0.3=37×0.3. Similarly, f(3) would be f(2)×0.3=(37×0.3)×0.3. We can see that with each step, we are multiplying by an additional factor of 0.3.
Generalizing the Pattern: To generalize this pattern, we can say that f(n) is equal to the first term, 37, multiplied by 0.3 raised to the power of (n−1), because for f(1), we have 0.3 raised to the power of 0 (which is 1), for f(2), we have 0.3 raised to the power of 1, and so on.
Explicit Formula: Therefore, the explicit formula for f(n) is f(n)=37⋅(0.3)(n−1).
More problems from Write variable expressions for geometric sequences