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The Formal Method:
(5)2 + (10)2 = (5)2 + (2 x 5)2 = (5)2 + (2)2(5)2 = 52 ( 1 + 4) = 52 (5) = (25) (5) = 125
The Easy Method:
52 = 25
102 = 100
52 + 102 = 25 + 100 = 125 .
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