Answers

2014-11-27T16:44:17+08:00
There are 4 of them of which we may be called special products. Or in other reference there are 3.
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1.) Product involving the distributive property of multiplication
     example:  3(x+y)
                      using distributive property you'll have:
                       3(x+y) = 3x + 3y
2.) Square of a Sum
     example: (x+1)²
                     =  x² + 2x + 1
3.) Square of a Difference
    example: (x-1)²
                    = x² - 2x + 1
4.) Difference of Two Squares
    example: (x+2)(x-2)
                    = x² - 4
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