Math Problem Statement

If f(x-2) = 3x - 5 for all values of x, which of the following is the expression for f(x)?

Solution

The problem asks us to find f(x)f(x) given that f(x2)=3x5f(x-2) = 3x - 5.

Step 1: Substitute x2=tx-2 = t

Let t=x2t = x - 2. Then x=t+2x = t + 2. Rewriting f(x2)f(x-2) in terms of tt, we have: f(t)=3(t+2)5f(t) = 3(t + 2) - 5

Step 2: Simplify the expression

Substitute t+2t + 2 into the equation: f(t)=3t+65=3t+1f(t) = 3t + 6 - 5 = 3t + 1

Step 3: Replace tt with xx

Since t=xt = x, we have: f(x)=3x+1f(x) = 3x + 1

Final Answer:

The correct choice is: B) f(x)=3x+1f(x) = 3x + 1

Would you like me to explain in more detail or cover related examples?


5 Related Questions:

  1. How can you verify your solution for f(x)f(x) using substitution?
  2. What happens if the given function f(x2)f(x-2) had a different constant, e.g., 3x73x - 7?
  3. How do transformations like f(x2)f(x-2) affect the graph of f(x)f(x)?
  4. Can this type of functional transformation be extended to quadratic or higher-degree functions?
  5. What are the key differences between f(x2)f(x-2) and f(x+2)f(x+2) in terms of behavior?

Tip:

When solving functional equations, always check if substituting values back into the original equation gives consistent results.

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Math Problem Analysis

Mathematical Concepts

Functions
Algebraic Substitution

Formulas

Transformation of function arguments: f(x-a) to f(x)

Theorems

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Suitable Grade Level

Grades 8-10