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Alpha Teach Yourself Algebra I in 24 Hours by Jane Cook

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Hour 23
Quadratic Equations: Solving by Three Methods
Knowing about square roots and radicals, how they are affected by the four basic operations, and how to solve radical equations prepares you for these final two hours of study. Solving an equation that has a squared variable relies on your ability to find the square root of a number and to simplify radical expressions. Factoring a polynomial will also come in handy.
 
To learn how to solve complex quadratic equations, you will be combining skills from many of the past 22 hours, especially the polynomial factoring in Hour 10 and the basic equations you solved in Hour 21. As with so many of the concepts in algebra, you will be expanding your mind’s ability to see a problem, consider your options, ...

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