Suppose you have a large number like 684, and you need to divide or factor it. You can look at the number and get a few clues that will help you. First, recognizing that the number is even, you know it's divisible by 2. But guess what? If you add the sum
of numbers together, and they equal a multiple of 3, then the number is divisible by 3. In this case, 684 (6+8+4) equals 18, which...
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It's a good idea to be neat when doing algebra. If you are having difficulty adding or subtracting horizontally, try doing it vertically, lining up the like terms. A lot of math teachers will give at least partial credit if part of the equation is correct.
Also, when your work is neat, you will be more apt to locate your errors prior to submitting your work. I demonstrate this neatness in the...
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This video takes combining unlike denominators a bit further, however, uses the exact steps as in video Fractions, Part 2a.

This video explains adding fractions with unlike denominators. I use this method because the steps in it make adding polynomial fractions with unlike denominators a lot easier. The exact same steps can be used for polynomials (video Fractions Part...

This video explains and compares reducing a "simple" fraction with a polynomial fraction, with a detailed explanation of both.

This video checks the solution of the video for solving for x using the quadratic equation. It includes the steps for reducing a root that, when computed, does not come out to be a perfect square, yet must be used in the FOIL method of the polynomial...

This is a step-by-step Algebra instructional video showing how to find X using the Quadratic Formula.

This 2-minute video describes in detail how to solve a polynomial. Please tell me what you think.