algerba basic points
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Basic Algebra Formula
a2 – b2 = (a – b)(a + b)
(a+b)2 = a2 + 2ab + b. ...
a2 + b2 = (a – b)2 + 2ab.
(a – b)2 = a2 – 2ab + b. ...
(a + b + c)2 = a2 + b2 + c2 + 2ab + 2ac + 2bc.
(a – b – c)2 = a2 + b2 + c2 – 2ab – 2ac + 2bc.
(a + b)3 = a3 + 3a2b + 3ab2 + b. ...
(a – b)3 = a3 – 3a2b + 3ab2 – b.
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