If x2 + y2 = 80 and xy = 12, find the value of (x - y).
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Answer:
by using formula
(x-y)^2=x^2+y^2-2xy
put the values
(x-y)^2=80-2×12
(x-y)^2=80-24
(x-y)^=56
x-y=√56
x-y=√2×2×7
x-y=2√7
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