Question

What we have to verify (a-b) (a-b) (a-b) = a×a×a-b×b×b -3(a-b)ab​

Answer 1

a minus b whole cube is equal to a cube plus b cube minus 3 AB

Answer 2

(a-b)(a-b)(a-b)=(a-b)^3

and a×a×a-b×b×b-3(a-b) ab=a^3-b^3-3(a-b) ab

and (a-b)^3=a^3-b^3-3(a-b) ab