Math Problem Statement

Find the inverse of the function using the rubric for the following: f(x) = 5x + 3, g(x) = (2x - 5)/3, h(x) = 2x^3 - 3, t(x) = (3x + 1)/(2x - 4).

Solution

The image contains a problem-solving task that asks to find the inverse of several functions. The functions are:

  1. f(x)=5x+3f(x) = 5x + 3
  2. g(x)=2x53g(x) = \frac{2x - 5}{3}
  3. h(x)=2x33h(x) = 2x^3 - 3
  4. t(x)=3x+12x4t(x) = \frac{3x + 1}{2x - 4}

Let me guide you through the process of finding the inverse for each function:

1. Finding the inverse of f(x)=5x+3f(x) = 5x + 3

To find the inverse, follow these steps:

  • Replace f(x)f(x) with yy: y=5x+3y = 5x + 3
  • Solve for xx: y3=5xx=y35y - 3 = 5x \quad \Rightarrow \quad x = \frac{y - 3}{5}
  • Replace yy with xx to get the inverse function: f1(x)=x35f^{-1}(x) = \frac{x - 3}{5}

2. Finding the inverse of g(x)=2x53g(x) = \frac{2x - 5}{3}

  • Replace g(x)g(x) with yy: y=2x53y = \frac{2x - 5}{3}
  • Solve for xx: 3y=2x52x=3y+5x=3y+523y = 2x - 5 \quad \Rightarrow \quad 2x = 3y + 5 \quad \Rightarrow \quad x = \frac{3y + 5}{2}
  • Replace yy with xx: g1(x)=3x+52g^{-1}(x) = \frac{3x + 5}{2}

3. Finding the inverse of h(x)=2x33h(x) = 2x^3 - 3

  • Replace h(x)h(x) with yy: y=2x33y = 2x^3 - 3
  • Solve for xx: y+3=2x3x3=y+32x=y+323y + 3 = 2x^3 \quad \Rightarrow \quad x^3 = \frac{y + 3}{2} \quad \Rightarrow \quad x = \sqrt[3]{\frac{y + 3}{2}}
  • Replace yy with xx: h1(x)=x+323h^{-1}(x) = \sqrt[3]{\frac{x + 3}{2}}

4. Finding the inverse of t(x)=3x+12x4t(x) = \frac{3x + 1}{2x - 4}

  • Replace t(x)t(x) with yy: y=3x+12x4y = \frac{3x + 1}{2x - 4}
  • Multiply both sides by 2x42x - 4: y(2x4)=3x+1y(2x - 4) = 3x + 1 Expand: 2xy4y=3x+12xy - 4y = 3x + 1
  • Get all terms involving xx on one side: 2xy3x=4y+12xy - 3x = 4y + 1 Factor xx on the left-hand side: x(2y3)=4y+1x(2y - 3) = 4y + 1
  • Solve for xx: x=4y+12y3x = \frac{4y + 1}{2y - 3}
  • Replace yy with xx: t1(x)=4x+12x3t^{-1}(x) = \frac{4x + 1}{2x - 3}

Would you like further details or have any questions?

Here are 5 related questions to expand this information:

  1. How can you verify if the calculated inverse function is correct?
  2. What types of functions do not have an inverse, and why?
  3. How does the graphical interpretation of a function's inverse look on the Cartesian plane?
  4. Are there any restrictions on the domains or ranges of the inverse functions obtained?
  5. Can all polynomial functions have inverses? Why or why not?

Tip:

Always check if the original function is one-to-one before finding its inverse, as only one-to-one functions have inverses.

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Math Problem Analysis

Mathematical Concepts

Inverse functions
Algebraic manipulation
Cubic functions
Rational functions

Formulas

Inverse of linear function: y = mx + b → x = (y - b)/m
Inverse of rational function: y = (ax + b)/(cx + d) → x = (dy + b)/(ay + c)
Inverse of cubic function: y = ax^3 + b → x = ((y - b)/a)^(1/3)

Theorems

Inverse function theorem

Suitable Grade Level

Grades 10-12