Question

using identities, evaluate 998^2​

Answer 1

Answer:

(998)²

= (1000₋2)²

Using (a-b)²= a²-2ab +b²

= (1000)² - 2×1000×2 + (2)²

= 1000000 - 4000 + 4

= 996004

Answer 2

Step-by-step explanation:

use second identity (a-b )^2 = a^2 + b^2 - 2ab