Maths Activity-
verification of formula [A+B]3=a3+b3+3a2b+3ab2.
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(a+b)^3=(a+b)^2 × (a+b)
=(a^2+2ab+b^2)×(a+b)
=a^3+2a^2b+ab^2+a^2b+2ab^2+b^3
=a^3+3a^2b+3ab^2+b^3
=(a^2+2ab+b^2)×(a+b)
=a^3+2a^2b+ab^2+a^2b+2ab^2+b^3
=a^3+3a^2b+3ab^2+b^3
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