Question

(a+b)^3-(a-b)^3
Please can anyone tell me this

Answer 1

(a+b)^3 - (a-b)^3

[x^3 - y^3 = (x - y) (x^2+y^2+xy)]

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

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

= 2b (3*a^2 + b^2) Ans...