Math Problem Statement

What is the inverse of \( f(x) = -3x + 5 \)?

Solution

To find the inverse of the function f(x)=3x+5f(x) = -3x + 5, we need to follow these steps:

  1. Rewrite the function by replacing f(x)f(x) with yy: y=3x+5y = -3x + 5

  2. Swap xx and yy to begin finding the inverse: x=3y+5x = -3y + 5

  3. Solve for yy:

    • First, isolate the term involving yy: x5=3yx - 5 = -3y
    • Then, divide by 3-3: y=13x+53y = -\frac{1}{3}x + \frac{5}{3}
  4. Rewrite yy as f1(x)f^{-1}(x): f1(x)=13x+53f^{-1}(x) = -\frac{1}{3}x + \frac{5}{3}

So, the correct answer is: f1(x)=13x+53f^{-1}(x) = -\frac{1}{3}x + \frac{5}{3}

This matches the second option in your list of choices.

Would you like further details on how the steps work, or do you have any questions?

Related Questions:

  1. How do you verify if two functions are inverses of each other?
  2. What are the key properties of inverse functions?
  3. Can all functions have inverses? Why or why not?
  4. How does the slope of the inverse compare to the original function?
  5. What is the geometric interpretation of finding an inverse function?

Tip: When finding the inverse of a function, always remember to switch xx and yy, then solve for yy again. This helps ensure accuracy.

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Math Problem Analysis

Mathematical Concepts

Algebra
Inverse Functions

Formulas

If \( y = f(x) \), switch \( x \) and \( y \), then solve for \( y \) to find \( f^{-1}(x) \).

Theorems

Inverse Function Theorem

Suitable Grade Level

Grades 10-12