Hi guys, could you please help as I have no idea how to simplify this DS question? and then answer it!!
What is the value of a^3-b^3?
a^3-b^3= (a-b)(a^2+ab+b^2) = S
1. a^2+ab+b^2= 0 --> S= 0 -->suff
2. -->a= 4b --> a^3-b^3= 64b^3- b^3= 63 b^3
we don't know b --> can't calculate S -->insuff
A it is.