Question

Evaluate the following using
suitable identity 998²-1​

Answer 1

Given to evaluate using suitable identity;

998² - 1

= (1000)² - 2(1000)(2) + (2)² - 1 [(a - b)² = a² - 2ab + b²]

= 1000000 - 4000 + 4 - 1

= 996004 - 1

= 996003

Thus, the evaluation for 998² - 1 is 996003.

Answer 2

998² - 1

= (1000)² - 2(1000)(2) + (2)² - 1

= 1000000 - 4000 + 4 - 1

= 996004 - 1

= 996003

More Information :-

Here we have used formula —

[(a - b)² = a² - 2ab + b²]