substract:
7xy+5^2-7y^2+3 from 7x^2-8xy+3y^2-5
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Step-by-step explanation:
7xy+5x2−7y2+3 from 7x2−8xy+3y2−5
=(7x2+3y2−8xy−5)−(7xy+5x2−7y2+3)
=7x2+3y2−8xy−5−7xy−5x2−7y2−5−3
=2x2+10y2−15xy−8
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