Math Problem Statement

If f, of, 1, equals, 2f(1)=2 and f, of, n, equals, f, of, n, minus, 1, minus, 4f(n)=f(n−1)−4 then find the value of f, of, 6f(6).

Solution

Let's analyze the function f(n)f(n) given by the recursive relation:

f(1)=2f(1) = 2

f(n)=f(n1)4for n>1f(n) = f(n-1) - 4 \quad \text{for } n > 1

We need to find the value of f(6)f(6).

Step 1: Calculate the first few terms using the recursive formula

  • f(1)=2f(1) = 2
  • f(2)=f(1)4=24=2f(2) = f(1) - 4 = 2 - 4 = -2
  • f(3)=f(2)4=24=6f(3) = f(2) - 4 = -2 - 4 = -6
  • f(4)=f(3)4=64=10f(4) = f(3) - 4 = -6 - 4 = -10
  • f(5)=f(4)4=104=14f(5) = f(4) - 4 = -10 - 4 = -14
  • f(6)=f(5)4=144=18f(6) = f(5) - 4 = -14 - 4 = -18

Step 2: Conclusion

So, the value of f(6)f(6) is:

18\boxed{-18}

Would you like more details on this solution or have any questions?


Here are 5 related questions to expand your understanding:

  1. How would you find f(10)f(10) using the same recursive relation?
  2. What is the general formula for f(n)f(n) based on this recursive definition?
  3. Can you determine f(0)f(0) or f(1)f(-1) assuming the pattern continues?
  4. What would happen if the recursive relation was f(n)=f(n1)+4f(n) = f(n-1) + 4?
  5. How would you verify if the function f(n)=4n+6f(n) = -4n + 6 satisfies the given recursive relation?

Tip: Recursive functions often generate arithmetic sequences, where each term is a fixed step away from the previous one. Recognizing this pattern can help solve problems efficiently.

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Math Problem Analysis

Mathematical Concepts

Recursive Functions
Arithmetic Sequences

Formulas

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Theorems

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Suitable Grade Level

Grades 7-9