1. 

(469 + 174)2 - (469 - 174)2 = ?
(469 x 174)

A. 2
B. 4
C. 295
D. 643

Answer: Option B

Explanation:

Given exp. = (a + b)2 - (a - b)2
ab

   = 4ab
ab

   = 4 (where a = 469, b = 174.)