Question

Evaluate (491) square in the form of (a-b) square

Answer 1

Explanation:

`(491)^(2) \\ \\ = (500 - 9)^(2) \\ \\ = ( {500})^(2) - 2 * 500 * 9 + ( {9})^(2) \\ \\ = 250000 - 9000 + 81 \\ \\ = 16000 + 81 \\ \\ = 16081 \\ \\ \huge\purple{ \boxed{\therefore (491)^(2)= 16081}}`