The positive numbers x and y satisfy xy = 1. Then the value of x such thatis minimum.
is a rational number
is an irrational number
is greater than two
is 2.
As xy = 1 or x = 1/y, we have
Hence the minimum value required is 1 and is got when
If three positive real numbers x, y, z satisfy y - x = z - y and xyz = 4, then what is the minimum possible value of y ?