Question

MCQ.

Factors of (a+b)^3-(a-b)^3 is :

a)2ab(3a^2+b^2)
b)ab(3a^2+b^2)
c)2b(3a^2+b^2)
d)3a^2+b^2​

Answer 1

Answer:

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

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

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

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

= c....

hope it helps you