Table of contents
- 0. Review of Algebra4h 16m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 6m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 19m
- 10. Combinatorics & Probability1h 45m
1. Equations & Inequalities
Linear Inequalities
3:17 minutes
Problem 79b
Textbook Question
Textbook QuestionSolve each inequality. Give the solution set in interval notation. (2x-1)(x+5)<0
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Inequalities
Inequalities express a relationship where one quantity is less than, greater than, less than or equal to, or greater than or equal to another. In this case, the inequality (2x-1)(x+5)<0 indicates that the product of the two expressions must be negative. Understanding how to manipulate and solve inequalities is crucial for finding the solution set.
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Factoring
Factoring involves breaking down an expression into simpler components, which can help in solving equations and inequalities. For the given inequality, factoring the expression (2x-1)(x+5) allows us to identify critical points where the expression changes sign. These points are essential for determining the intervals to test for the solution.
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Interval Notation
Interval notation is a mathematical notation used to represent a range of values. It uses parentheses and brackets to indicate whether endpoints are included or excluded. In the context of the inequality solution, expressing the solution set in interval notation provides a clear and concise way to communicate the values of x that satisfy the inequality.
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