STEM Lessons for College Students

Solving Quadratic Inequalities Using Sign Analysis

Learn how to solve quadratic inequalities using sign analysis in this free math video tutorial by Mario’s Math Tutoring. We go through 2 examples in detail.

0:24 Example 1 First Step is to Factor and Set Factors Equal to Zero
0:41 Plot the Zeros on the Number Line
1:00 Choose Test Values in Each Interval for Sign Analysis
2:16 Writing the Solution in Interval Notation and Inequality Notation
2:46 Graphing the Quadratic in 2 Dimensions to Demonstrate
3:29 Example 2 Solving 2x^2-7x-15

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Solving Rational Inequalities

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