Bytelearn - cat image with glassesAI tutor

Welcome to Bytelearn!

Let’s check out your problem:

{[f(1)=37],[f(n)=f(n-1)*0.3]:}
Find an explicit formula for 
f(n).

f(n)=

{f(1)=37,f(n)=f(n1)×0.3\begin{cases} f(1)=37, f(n)=f(n-1)\times 0.3 \end{cases} Find an explicit formula for f(n)f(n).f(n)=f(n)=

Full solution

Q. {f(1)=37,f(n)=f(n1)×0.3\begin{cases} f(1)=37, f(n)=f(n-1)\times 0.3 \end{cases} Find an explicit formula for f(n)f(n).f(n)=f(n)=
  1. Given Sequence: We are given a recursive sequence where the first term is f(1)=37f(1) = 37 and each subsequent term is found by multiplying the previous term by 0.30.3. To find an explicit formula for f(n)f(n), we need to express f(n)f(n) in terms of nn without referencing previous terms.
  2. Examining the Pattern: Let's examine the pattern of the sequence to find the explicit formula. We know that f(1)=37f(1) = 37. According to the recursive formula, f(2)f(2) would be f(1)×0.3=37×0.3f(1) \times 0.3 = 37 \times 0.3. Similarly, f(3)f(3) would be f(2)×0.3=(37×0.3)×0.3f(2) \times 0.3 = (37 \times 0.3) \times 0.3. We can see that with each step, we are multiplying by an additional factor of 0.30.3.
  3. Generalizing the Pattern: To generalize this pattern, we can say that f(n)f(n) is equal to the first term, 3737, multiplied by 0.30.3 raised to the power of (n1)(n-1), because for f(1)f(1), we have 0.30.3 raised to the power of 00 (which is 11), for f(2)f(2), we have 0.30.3 raised to the power of 11, and so on.
  4. Explicit Formula: Therefore, the explicit formula for f(n)f(n) is f(n)=37(0.3)(n1)f(n) = 37 \cdot (0.3)^{(n-1)}.

More problems from Write variable expressions for geometric sequences