Question
{(481 + 426)2 – 4 × 481 × 426} = ?
A. 3025
B. 3060
C. 3210
D. 4200
Answer: A
Solution:
Given statement is like (a+b)2− 4ab where a=481 and b=426
(a+b)2−4ab
=(a2+2ab+b2)−4ab
=a2−2ab+b2
=(a−b)2
Hence
(481+426)2−4×481×426
=(481−426)2
=552
=3025