Q1 of 95 Page 72

Now compute the squares of these numbers in head:

105

Using (x+y)2 = x2 + xy +yx +y2

(105)2 = (100 + 5)2


=(100)2 + 2×100×5 + (5)2


= 10000 + 1000 + 25


= 11025


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