A well known and free guide to learn algebra would be from a place called Khan Academy. It is one of the biggest online tutoring sites that holds hundreds of science and math related guides. Its explanations are simple yet clear, and almost every aspect of math is explained on it.
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Algebra is using variables such as x to solve a problem. One example is x+3=8 in which x equals 5.
You need not have x in an algebraic equation. You solve whichever one is the easiest and that depends on the set of equations that you have.
The basic principle of algebra is the equal sign. Whatever you do to one side you must do to the other. Try to rearrange the terms in such a way that you isolate or solve the variable.
The Quadratic formula in mathematics is used to solve quadratic equations in algebra. The simplest way to solve these equations is to set each of the factors to zero and then solve each factor separately.
There are several websites that have algebra worksheets one can download free. Among these websites is one called Math Drill, and there is another called Math.