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OpenStudy (anonymous):
If x2 + y2 = 100, and xy = 18, find the value of x - y.
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OpenStudy (kamille):
Firstly, you need to solve the system of equations. Do you know how to do it?
OpenStudy (akashdeepdeb):
Or use (x-y)2 = x2 + y2 - 2xy = 100 - 36 = 64 Now (x-y) = rt 64 = 8 !! :D
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