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Practical Algebra Lessons - Purplemath


Practical algebra lessons that emphasize the practicalities of understanding ...

An Ordered Listing of the Lessons - Purplemath


An Ordered Listing of the Lessons. The Purplemath lessons have been written ...

Solving Linear Equations: 'One-Step' Equations - Purplemath


"Linear" equations are equations with just a plain old variable like "x", rather ...

Free Online Tutoring and Lessons - Purplemath


Links to algebra-lessons web sites, with ... free (or free-to-try) off-site tutoring and ... online lessons to its print offerings.

Quizzes and Worksheets - Reviews - Purplemath


Links to web sites offering quizzes and worksheets; reviewed by Purplemath.

Solving Inequalities: An Overview - Purplemath


Solving linear inequalities is very similar to solving linear equations, except for ...

Mean, Median, Mode, and Range - Purplemath


Explains how to compute the mean, median, mode, and range of a list of ...

Functions versus Relations - Purplemath


Discusses the concept of functions versus relations, and demonstrates ways of ...

Straight-Line Equations: Slope-Intercept Form - Purplemath


Covers the 'slope-intercept', or 'y = mx + b', form of straight-line equations.

Trigonometric Identities - Purplemath


Lists the basic trigonometric identities, and specifies the set to keep track of for  ...

Popular Q&A
Q: Help me understand a PurpleMath example?
A: We have the identity: x^3 - a^3 = (x - a) (x^2 + ax + a^2) In our case, we have a^3 = 8, so a = 2. ----- Personally, I would have done it this way: 0 = x^3 - 8 ... Read More »
Source: answers.yahoo.com
Q: Help me understand an example from PurpleMath?
A: They factored the (x^3-8) into (x-2).... Source(s): Math Major Read More »
Source: answers.yahoo.com
Q: Http //www.purplemath.com/modules/graphexp.htm http //www.purplem...
A: Hello J Lem! Please see: file Sincerely, Sk1lz Read More »
Source: www.justanswer.com
Q: So yesterday im working on quadratics and now they jump from chap...
A: 1) When you find f(3) you just plug in 3 for x, so you would have f(3) = 3^2 - 7(3) = 9 - 21 = -12. Similarly, when you want to find f(a-4) you plug in a-4 for ... Read More »
Source: answers.yahoo.com
Helpful Resources



Purplemath contains practical algebra lessons demonstrating useful techniques and pointing out common errors. Lessons are written with the struggling student ...