Question

use the below identity to find the following: (1) 501×502? {( x^2+x(a+b) + ab = (x+a) (x+b)}​

Answer 1

Answer:

= 500² + 500( 1 + 2 ) + 1 × 2

= 250000 + 1500 + 2

= 251502

Answer 2

Answer:

$\bold{using \: identity ={[( {x}^{2} + x(a + b) + ab = (x + a)(x + b)]} }$

$= 500² + 500( 1 + 2 ) + 1 × 2 \\ = 250000 + 1500 + 2 \\ = 251502$

hope it helps you