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mathematicsprinted 37 · PDF 38
165 pagesrevision 46935
printed 37 · PDF 38
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Step 2: Find the roots (where the expression equals zero).
Step 3: Test intervals to determine where the inequality holds.
5. Representing Solutions on a Number Line
Open Circle: Use for < and > (not including the endpoint).
Closed Circle: Use for ≤ and ≥ (including the endpoint).
6. Graphical Representation of Quadratic Inequalities
Use a number line or a coordinate plane to show the regions where the inequality is
satisfied. Then plot the roots and use open or closed circles depending on the
inequality sign.
(Always check your solutions by substituting back into the original inequality.