Question

solve this problem by using identity​

Answer 1

Answer:

79 cube means 79 *79*79= 439039

Answer 2

Answer:

493039

Step-by-step explanation:

(79)^3 can be written as (80-1)^3

Therefore we can use the identity,

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

(80-1)^3

=80^3-1^3-3×80^2×1+3×80×1^2

=5,12,000-1-19,200+240

= 4,93,039

The whole cube of seventy nine is 4,93,038.

Solved using identity....

Hope it helps :)