Refer NCERT Exemplar Problems for questions and solution- Click Here (http://ncert.nic.in/ncerts/l/ieep202.pdf)

X3- Y3 = (x - y) • (x2 + xy + y2)

Hello,

If you want to ask about X cube minus Y cube then there's a formula given in algebra. The formula is X3-Y3 =(X-Y) • (X2 +XY +Y2). The solution for this is   

R.H.S =(X-Y)•(X2+XY+Y2) 

            =X3+X2Y+XY2-YX2-Y2X-Y3 

            =X3+(X2Y-YX2)+(XY2-Y2X)-Y3 

            =X3+0+0+Y3 

            =X3+Y3

            =L.H.S

Hope this helps. All the best!!!