Math Problem Statement

Consider the following. f(x) = 7 x2 − 3 Describe the interval(s) on which the function is continuous. (Enter your answer using interval notation.)

Identify any discontinuities. (Enter your answers as a comma-separated list. If an answer does not exist, enter DNE.) x =

Solution

The function f(x)=7x23f(x) = \frac{7}{x^2 - 3} is a rational function, which is continuous wherever the denominator is not equal to zero. To identify any discontinuities, we need to solve for xx where the denominator equals zero:

x23=0x^2 - 3 = 0

Solving for xx:

x2=3x^2 = 3 x=±3x = \pm \sqrt{3}

Thus, the function has discontinuities at x=3x = \sqrt{3} and x=3x = -\sqrt{3}.

Interval of Continuity:

The function is continuous on the intervals where the denominator is non-zero. The function is continuous everywhere except at x=±3x = \pm \sqrt{3}. So, the intervals of continuity are:

(,3)(3,3)(3,)(-\infty, -\sqrt{3}) \cup (-\sqrt{3}, \sqrt{3}) \cup (\sqrt{3}, \infty)

Discontinuities:

The function has discontinuities at x=3x = -\sqrt{3} and x=3x = \sqrt{3}.

Final Answer:

  • Interval(s) of continuity: (,3)(3,3)(3,)(-\infty, -\sqrt{3}) \cup (-\sqrt{3}, \sqrt{3}) \cup (\sqrt{3}, \infty)
  • Discontinuities: x=3,3x = -\sqrt{3}, \sqrt{3}

Would you like further clarification on this process, or do you have any other questions? Here are some related questions to explore:

  1. How does the presence of a discontinuity affect the graph of a rational function?
  2. What are the different types of discontinuities that can occur in rational functions?
  3. How can you find the domain of a rational function?
  4. What is the difference between removable and non-removable discontinuities?
  5. How can you check the continuity of a function using limits?

Tip: To check the continuity of a function at a specific point, you can evaluate the left-hand and right-hand limits at that point and ensure they match the function's value there.

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Math Problem Analysis

Mathematical Concepts

Rational Functions
Continuity
Discontinuities
Interval Notation

Formulas

f(x) = 7 / (x^2 − 3)
x^2 − 3 = 0

Theorems

Continuity of Rational Functions

Suitable Grade Level

Grades 11-12