Using identity (x + a) (x + b) = x2 + (a + b) x + ab, find the value

1.	Using identity (x + a) (x + b) = x2 + (a + b) x + ab, find the value of following – 201 x 202.
Answer» 201 x 202 = (200 + 1) x (200 + 2) = (200)² + (1 + 2) (200) + 1 x 2 (Using given identity) = 40000 + 600 + 2 = 40602

Using identity (x + a) (x + b) = x2 + (a + b) x + ab, find the value of following – 201 x 202.

Answer»

201 x 202

= (200 + 1) x (200 + 2)

= (200)² + (1 + 2) (200) + 1 x 2 (Using given identity)

= 40000 + 600 + 2

= 40602