Q:

Please help me I can't figure this one out!!f(x)= 2/x-6g(x)= 6x+2/xDetermine whether or not f(x) and g(x) are inverses of each other.

Accepted Solution

A:
two functions f(x) and g(x) are called inverse of each other when these follow this rule. if we put x in f we get value f(x) then putting f(x) in g should give us value x in other word let's say I put x = a in f(x) we get f(a)now when we will put x = f(a) in g(x) we should get a back. then they called inverse of each other. let's take an example f(x) = 4x-2 g(x) = (x+2)/4let's put x = 1 in f(x)f(1) = 4Γ—1-2 = 4-2 = 2f(1)= 2now we will put 2 in g(x) and it should give us value 1 g(f(1))= g(2) =(2+2)/4= 4/4 = 1yes we got 1. doing same in reverse order . that is we will check now g(x) first. lets take x= -2 for simplificationg(-2) = (-2+2)/4 = 0now f(0) = 4Γ—0-2 = -2 yes we got it again so in this case functions are inverse to each other. mathematicallyg(f(x)) = x = f(g(x))let's prove that if above function follows this or not .f(x) = 2/x - 6g(x) = 6x + 2/xlet's calculate g(f(x)) first g(f(x)) = g(2/x -6) = 6(2/x -6) + 2/(2/x -6)= 12/x -36 + 2x/(2-6x) which is not equal to x so we don't have to proceed further. they are not inverse of each other