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प्रश्न
Find the squares of the following:
9m - 2n
उत्तर
Using (x + y)2
= x2 + 2xy + y2, we get
(9m - 2n)2
= (9m)2 + 2(9m)(-2n) + (-2n)2
= 81m2 - 36mn + 4n2.
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