.. What should be subtracted from 3xy - 2x² – 2y2 to obtain 5x2 – 7xy + 5y2?
a) 10xy - 7x2 – 7y2
b) --4xy – 7x2 - 7y2
c) 7x2 - 10xy + 7y2
d) 10xy + 7x2 + 7y2
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Therefoe
the answer is
(a) 10xy-7x2-7y2
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