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Alpha Teach Yourself Algebra I in 24 Hours by Jane Cook

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Hour 24
Quadratic Equations: Solving by the Quadratic Formula
It’s appropriate that your last hour of algebra study takes a closer look at quadratic equations. Equations are the heart and soul of algebra, and solving different types of quadratic equations brings together almost every topic you’ve studied during the past 23 hours. You’ll see one more way to solve these equations, get some hints on which method is best to use, and work out practical problems that need quadratic equations to reach a solution.
 
The methods of solving quadratic equations that you learned last hour—finding the square root, factoring, and completing the square—will usually lead to the solutions. Some quadratic equations just don’t work well with any of these three ...

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