Factors and Expansion
Factors and expansion rules
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Rules of factors and expansion can be expressed as
(a + b)2 = a2 + 2 ab + b2 (1)
(a - b)2 = a2 - 2ab + b2 (2)
(a + b)3 = a3 + 3a2b + 3ab2 + b3 (3)
(a - b)3 = a3 - 3a2b + 3 ab2 - b3 (4)
(a2 - b2) = (a - b) (a + b) (5)
(a3 - b3) = (a - b) (a2 + ab + b2) (6)
(a3 + b3) = (a + b) (a2 - ab + b2) (7)
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