Solving and Graphing Polynomial and Rational Inequalities

Professor Dave Explains
27 Nov 201707:34
EducationalLearning
32 Likes 10 Comments

TLDRThe video explains how to solve, graph, and interpret inequalities involving polynomials and rational functions. It starts with solving polynomial inequalities by combining terms, treating as an equation, finding zeroes, and testing points to determine valid intervals. It then covers graphing polynomial inequalities by treating as an equation, graphing, and shading regions above the graph. Next it explains how to solve rational inequalities by finding asymptotes and intercepts, graphing, and determining intervals where the function is positive. Overall, the video provides step-by-step guidance and visuals to help grasp solving, graphing, and comprehending polynomial and rational inequalities.

Takeaways
  • 😀 Inequalities state that one side is greater than or less than the other, not equal like equations.
  • 😮 To solve complex inequalities, move all terms to one side so the inequality is greater than/less than 0.
  • 📈 Solve the resulting equation, then test points between solutions to see which intervals satisfy the inequality.
  • 📊 Graphing inequalities with two variables involves treating it like an equation first to plot, then shading above/below.
  • 🔼 For Y ≥ X + 2, shade above the line since Y must be ≥ the line's Y value for each X.
  • 📉 Solve rational inequalities by finding zeros, asymptotes, testing points to sketch, then see where >/</= 0.
  • ✏️ Graph polynomial and rational inequalities by sketching the function, then shading regions above/below/between zeros.
  • 💡 Solve inequalities by treating =, solve the equation, then determine which intervals actually satisfy the <, >, ≤, ≥.
  • 🤓 Use interval notation with parentheses for exclusive endpoints, brackets for inclusive endpoints when expressing solutions.
  • 🧮 This covers the key ideas for solving and graphing polynomial and rational inequalities.
Q & A

  • How is graphing inequalities similar to graphing functions?

    -Graphing inequalities is extremely similar to graphing functions. The key differences are that inequalities allow for multiple solutions rather than just one, and the graph shows the regions where the inequality is satisfied rather than just plotting a single line or curve.

  • What is the process for solving more complex inequalities algebraically?

    -To solve more complex inequalities algebraically: 1) Get all terms on one side so the inequality is greater than or less than 0. 2) Treat the inequality like an equation and solve it. 3) Test points from the different intervals between solutions to see which satisfy the original inequality.

  • How do you graph a polynomial inequality with two variables?

    -To graph a polynomial inequality with two variables, first treat it like an equation and graph the corresponding line or curve. Then determine which side of the graph satisfies the inequality and shade in that region.

  • What are the steps for solving and graphing a rational inequality?

    -For a rational inequality: 1) Find the x-intercept(s) by setting equal to 0. 2) Find vertical asymptotes. 3) Graph function by testing points. 4) Shade region(s) where function is greater than or less than 0 per the inequality.

  • What notation is used to show the solution set to an inequality?

    -Parentheses or brackets are used to denote inclusive or exclusive endpoints for the solution intervals. The union symbol (U) is used to combine multiple intervals that satisfy the inequality.

  • What is the difference between an equation and an inequality?

    -An equation states two expressions are equal to one another. An inequality states one expression is greater than or less than another expression.

  • What are some examples of symbols used in inequalities?

    ->, <, ≥, ≤ are symbols used in inequalities to indicate greater than, less than, greater than or equal to, and less than or equal to.

  • What is an example of an interval notation for the solution to an inequality?

    -(-∞, 3) U (5, ∞) indicates the solution includes all real numbers less than 3 together with all real numbers greater than 5.

  • How do you determine if a point satisfies an inequality?

    -Plug the point into the original inequality to see if it makes the inequality a true statement. If so, the point satisfies the inequality.

  • Can a quadratic inequality have more than two intervals as solutions?

    -Yes, a quadratic inequality can have up to three intervals as solutions depending on whether it crosses the x-axis once or twice.

Outlines
00:00
😀 Graphing Inequalities

This paragraph introduces inequalities, explaining how they differ from equations in that one side is greater or less than the other. It covers how to solve basic inequalities algebraically, by isolating the variable on one side. It then demonstrates how to graph the solution on a number line by testing points from different intervals.

05:00
😀 Graphing Polynomial Inequalities

This paragraph explains how to solve more complex polynomial inequalities algebraically. It involves moving all terms to one side, factoring if needed, finding roots, and testing points from intervals between roots to determine which satisfy the inequality. It also covers graphing inequalities with two variables, treating them as equations first and then shading the region above or below the graph line.

😀 Graphing Rational Inequalities

This paragraph demonstrates how to solve and graph rational inequalities. It involves finding zeros, asymptotes, and sketching the function to determine intervals where it is above or below the x-axis. Those intervals that satisfy the >0 or <0 condition are the solution regions to shade.

Mindmap
Keywords
💡inequality
An inequality states that one mathematical expression is greater or less than another. It differs from an equation in that the two sides are not equal. Inequalities are important in the video because graphing and solving inequalities is the main topic.
💡graphing
The process of creating a graphical representation of a mathematical relationship. A key part of the video is learning how to graph inequalities on a coordinate plane, in order to visualize the solutions.
💡number line
A number line represents all real numbers and their relative positions. It is used to denote the solutions to inequalities in interval notation.
💡interval notation
A way to represent a range or set of numbers between two endpoints. Used to show solutions to inequalities on the number line. Example: (-∞, -3) U (-1, ∞)
💡shading
On a coordinate plane, the area that satisfies an inequality is shaded in. Shading above or below a graphed line denotes solutions.
💡vertical asymptote
A vertical line that a function gets closer and closer to but never reaches. Finding asymptotes is important for graphing rational inequalities.
💡X-intercept
The point where a graphed function crosses the x-axis. Useful for sketching rational functions when graphing rational inequalities.
💡polynomial inequality
An inequality containing polynomial functions with variables raised to whole number powers. They are graphed similarly to polynomial functions.
💡rational inequality
An inequality containing one or more rational functions. They are graphed similarly to rational functions.
💡solving
The process of finding the value(s) that satisfy an inequality. Solving approaches are covered for various inequality types in the video.
Highlights

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Emphasis on understanding interactions between microglia and other CNS cell types.

Potential clinical translation highlighted for diagnostic and therapeutic applications.

Call for integrated, collaborative approaches to uncover microglia biology in neurodegeneration.

Transcripts

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