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## Answers

(a-b)^2= a^2 + b^2 -2ab

(a+b)(a-b)=a^2 - b^2

(a+b)^3= a^3 + 3a^2b +3ab^2 + b^3

(a-b)^3= a^3 - 3a^2b + 3ab^2 -b^3

(a+b)^4= a^4 + 4a^3b +6a^2b^2 + 4ab^3 + b^4

(a+b)( a^2 -ab + b^2 )=a^3 + b^3

(a - b)(a^2 + ab + b^2) = a^3 - b^3

(a +b+c)^2=a^2 + b^2 + c^2 +2ab + 2bc +2ca

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