Q. 2

If f is a real function satisfying for all x R – {0}, then write the expression for f (x).

Answer :

{since, (a + b)2 = a2 +b2 +2ab}

f(y) =

x + 1 = xy

x2 -yx+1= 0

for x to be real

y (-∞,2][2,∞)


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