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107 x 107 + 93 x 93 = ?

19578
19418
20098
21908
Explanation:

107 x 107 + 93 x 93= (107)2 + (93)2

= (100 + 7)2 + (100 - 7)2

= 2 x [(100)2 + 72]   [Ref: (a + b)2 + (a - b)2 = 2(a2 + b2)]

= 20098

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