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Common Algebra Formulae

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Following are the most commonly and widely used algebra equations.

1) (a+b)2=a2+b2+2ab
2) (a-b)2=a2+b2-2ab
3) (a+b+c)2=a2+b2+c2+2ab+2bc+2ca
4) (a+b)(a-b)= a2-b2
5) (a+b)3= a3+b3+3ab(a+b)
6) (a-b)3= a3-b3-3ab(a-b)
7) (a+b)2-(a-b)2=4ab
8 ) (a+b)2+(a-b)2=2(a2+b2)

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