Question

Evaluate the following using appropriate identies : (49)cube and (999)cube

Answer 1

(49)^3=(50-1)^3
= (a-b)^3
=a cube - b cube- 3ab(a-b)
=(50)^3-(1)^3-3×50×1(50-1)
=12500-1-150(49)
=6117601

999 cube =1000-1 cube
=1000 cube-1 cube- 3×1000×1(1000-1)
=1000000000-1-3000(999)
=999996999(999)
now u can calculate pls mark it as brainliest