Using (a-b) square =a square - 2ab +b square ,find the value of (689) square
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Answer:
474721
(689)square = (700-11)square
IDENTITY: (a-b)square = (a)square + (b)square -2(ab)
therefore, (700-11)square = (700)square + (11)square - 2(700 multiply by 11)
= 490000 + 121 - 15400
= 474721
Hope you are satisfied by the answer
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