Math Problem Statement

What is f^{-1}(x) if f(x) = 2x + 6?

Solution

To find the inverse function f1(x)f^{-1}(x) of the function f(x)=2x+6f(x) = 2x + 6, we need to follow these steps:

  1. Replace f(x)f(x) with yy: y=2x+6y = 2x + 6

  2. Swap xx and yy to solve for the inverse: x=2y+6x = 2y + 6

  3. Isolate yy: Subtract 6 from both sides: x6=2yx - 6 = 2y Then, divide both sides by 2: y=x62y = \frac{x - 6}{2}

  4. Replace yy with f1(x)f^{-1}(x): f1(x)=x62f^{-1}(x) = \frac{x - 6}{2}

So, in the format of the answer on the screen, the solution is: f1(x)=12x3f^{-1}(x) = \frac{1}{2}x - 3

Filling in the Blanks:

  1. The coefficient of xx in f1(x)f^{-1}(x) is 12\frac{1}{2}.
  2. The constant term is 3-3.

Would you like further details on any part of this solution?


Related Questions:

  1. How do you find the inverse of functions with a different slope and intercept?
  2. What are some key properties of inverse functions?
  3. How can you verify that two functions are inverses of each other?
  4. How does the concept of inverse functions apply to real-world scenarios?
  5. What is the significance of finding the inverse of a function in calculus?

Tip:

To verify that f1(x)f^{-1}(x) is correct, compose f(f1(x))f(f^{-1}(x)) and f1(f(x))f^{-1}(f(x)); if both equal xx, then the functions are true inverses.

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Math Problem Analysis

Mathematical Concepts

Algebra
Inverse Functions

Formulas

Inverse function formula: switch x and y, solve for y

Theorems

Inverse Function Theorem

Suitable Grade Level

Grades 9-10