SOLUTION: if x-y=7, xy=-8, what is the value of x^2+3xy+y^2

SOLUTION: if x-y=7, xy=-8, what is the value of x^2+3xy+y^2

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Question 892936: if x-y=7, xy=-8, what is the value of x^2+3xy+y^2
Answer by Edwin McCravy(20055) (Show Source): You can put this solution on YOUR website!



Square both sides of





Add  to both sides:



Since , substitute  for  on the right:







Edwin

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