Studying equations and inequalities? You're in the right place. We've collected dozens of free videos, step-by-step tutorials, and online study tools to help you learn about quadratic inequalities, interval notation, and more.
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Step-by-step solutions to odd-numbered problems from dozens of precalculus textbooks.
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Hotmath
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Interactive Page with rules for working with inequalities
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Math.Com
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A discussion using interval notation.
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Ask Dr. Math
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A discussion of specific problems.
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Ask Dr. Math
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An explanation of flipping the sign when multiplying by a negative.
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Ask Dr. Math
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A discussion of tracking possible negative and positive results.
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Ask Dr. Math
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This video includes sample exercises and step-by-step explanations of graphing inequalities for the California Standards Test.
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Khan Academy
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A discussion of negative and positive results with variables in the denominator of an inequality.
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Ask Dr. Math
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