If f(x , y) = ((x + y)^2)/(xy) for every x, y > 0 then f(x,y) must be – InterviewSolution

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1.	If f(x , y) = ((x + y)^2)/(xy) for every x, y > 0 then f(x,y) must be :
Answer» `GE 2` `lt 5` `ge 4` none of these Solution :f9x, y) = `(x^2+y^2+2xy)/(xy) = x/y + y/x +2` The minimum value of `x/y + y/x` = 2 at x = y Therefore f(x,y) = `((x+y)/xy)^2 ge 4`

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