387 x 387 + 114 x 114 + 2 x 387 x 114 =?

Given expression = a²+b²+2ab = (a+b)²
where a = 387 and b = 114
= (387 + 114 )²
= (501)²
=(500 +1 )²
=(500)² + (1)²+ 2 x 500 x 1
= 250000 + 1 +1000 = 251001.