Zeros of a rational function

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Taught by MrLovellFord
  • Currently 3.0/5 Stars.
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Lesson Summary:

In this lesson, we learn how to find the zeros and asymptotes of a rational function. By setting the numerator equal to zero, we can find the values of x that make the function zero, which correspond to where the graph crosses the x-axis. Additionally, we can find the vertical asymptotes by setting the denominator equal to zero. Through an example problem, we see how to factor and solve for x to determine the zeros, which can help us better understand the behavior of the function.

Lesson Description:

Given a rational functions that consists of a ratio of rational functions, setting the top expression (the numerator) equal to zero and then solving for x allows you to find values of x that cause the value of the function (y-value) to equal zero. When graphing, this is where the graph you are drawing will cross the x-axis.

Questions answered by this video:
  • What are the zeroes of a rational function?
  • How do you find the zeroes of a rational function?
  • What are the zeroes of f(x) = (3x^2 - 27)/(x^2 - 36)?
  • Staff Review

    • Currently 4.0/5 Stars.
    This lesson explains what zeroes of a function are and how to find them for a rational function. All concept and steps are explained very well in this lesson.