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Find x^2 -y^2 given that x+y =7 and x-y= 3
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Find x^2 -y^2 given that x+y =7 and x-y= 3

User Yoiku
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1 Answer

2 votes

Use the difference of squares identity.


x^2 - y^2 = (x + y) (x - y) = 7\cdot3 = \boxed{21}

User Hugh Jeffner
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