evaluate using the identities 61 sq - 39 sq
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abnaiqh doob awaz toot 589 bbc 91 ho ek no de la gyi thi nahi na tha maine time is se qgcwhz rico Inonu 6Z1 hZ todo
priyanka893:
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61^2-39^2 is in the form of a^2-b^2 is(a+b)(a-b) so (61+39)(61-39)=(100)(22)=2200
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