Question

the difference between squares of two numbers 1002 and 998

Answer 1

difference is of

1002×1002=1004004

998×998=996004

1004004-996004=8000

Answer 2

(1002)^2-(998)^2

(1002-998)(1002+998)

(4)(2000)

8000.

the answer is 8000.

here we use the identity ,

a^2-b^2=(a-b)(a+b).