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OpenStudy (anonymous):
If x-y=7 and xy=-23/2, find x^2+y^2. Please show all your work.
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OpenStudy (anonymous):
the answer is: 26
OpenStudy (anonymous):
Please can you explain
OpenStudy (anonymous):
x-y=7, xy=-23/2 so x^2+y^2=(x-y)^2+2xy=7^2+2(-23/2)=49-23=26
OpenStudy (anonymous):
Thanks
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