difference of squares
This form may be used for multiplying any sum of two numbers (terms) by the difference of the same numbers (terms).
In the form
the formula is used for factoring binomials which are the difference of two squares.
(1) is sometimes called the conjugate rule, especially in articles written in Sweden (in Swedish: konjugatregel).
(1) is an identic equation for all numbers and, more generally, for arbitrary elements of any commutative ring. Conversely, it is easy to justify that if (1) is true for all elements of a ring, then the ring is commutative. By the way, and also commute with each other in a non-commutative ring.
|Title||difference of squares|
|Date of creation||2013-03-22 17:45:11|
|Last modified on||2013-03-22 17:45:11|
|Last modified by||pahio (2872)|