Math Problem Statement

Find the equation of the domain in interval notation and the equation of the slant asymptote of the rational function: f(x) = (4x^2 - 4x - 1) / (2x - 3).

Solution

To solve the problem, we need to find:

  1. The domain of the function f(x)=4x24x12x3f(x) = \frac{4x^2 - 4x - 1}{2x - 3}.
  2. The equation of the slant asymptote.

Step 1: Domain in interval notation

The domain of a rational function is determined by the values that make the denominator equal to zero, as division by zero is undefined. The denominator of the function is 2x32x - 3. Set it equal to zero:

2x3=0    x=322x - 3 = 0 \implies x = \frac{3}{2}

Thus, x=32x = \frac{3}{2} is not in the domain. The domain excludes this value and is expressed in interval notation as:

(,32)(32,)(-\infty, \frac{3}{2}) \cup (\frac{3}{2}, \infty)

Step 2: Slant asymptote

A slant asymptote exists when the degree of the numerator is exactly one higher than the degree of the denominator. In this case, the numerator is quadratic (4x24x14x^2 - 4x - 1) and the denominator is linear (2x32x - 3).

To find the equation of the slant asymptote, we perform polynomial long division of 4x24x14x^2 - 4x - 1 by 2x32x - 3.

Division process:

  1. Divide the leading term of the numerator (4x24x^2) by the leading term of the denominator (2x2x) to get 2x2x.
  2. Multiply 2x2x by 2x32x - 3 to get 4x26x4x^2 - 6x.
  3. Subtract 4x26x4x^2 - 6x from the original numerator 4x24x14x^2 - 4x - 1, resulting in 2x12x - 1.
  4. Divide 2x2x by 2x2x to get 11.
  5. Multiply 11 by 2x32x - 3 to get 2x32x - 3.
  6. Subtract 2x32x - 3 from 2x12x - 1, resulting in 22.

So the quotient is 2x+12x + 1 and the remainder is 2. The equation of the slant asymptote is given by the quotient, which is:

y=2x+1y = 2x + 1

Final answers:

  • The domain in interval notation is: (,32)(32,)(-\infty, \frac{3}{2}) \cup (\frac{3}{2}, \infty)
  • The equation of the slant asymptote is: y=2x+1y = 2x + 1

Would you like further clarification on any of these steps?

Here are five related questions you might explore:

  1. How do you find vertical asymptotes for rational functions?
  2. What is the difference between a horizontal and slant asymptote?
  3. How can we determine whether a rational function has a hole?
  4. What happens

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Math Problem Analysis

Mathematical Concepts

Rational Functions
Slant Asymptotes
Polynomial Long Division

Formulas

Domain: Denominator ≠ 0
Slant Asymptote: Polynomial Long Division

Theorems

Rational Function Domain
Polynomial Long Division Theorem

Suitable Grade Level

Grades 10-12