160 x 106 + 94 x 94 =?

106 x 106 + 94 x 94 =(106)² + (94)²
=1/2 [2(a² + b²)]
=1/2 [(a+b)² + (a-b)²]
=1/2 [(106 + 94)² + (106 -94 )²]
=1/2 [ (200)² + (12)²]
= 1/2 x [ 40000 + 144 ]
= 40144/2
= 20072 .