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  1. 160 x 106 + 94 x 94 = ?
    1. 21032
    2. 20032
    3. 23032
    4. 20072
Correct Option: D

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 .


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