Tanyanagra wrote:
I have reached the substitution but unable to get the process after that...
Hi Tanyanagra,
For me using substitution is better than trying to manipulate the variables, especially under pressure....here's how I solve it !
Substitute x=2 into this 1st equation:
f(x) = x divided by x+1 f(2) = 2 divided by 2+1 =
2/3Then, the question asks what is f(1/x) in terms of f(x)?
You'll need to convert the f(x) to f(1/x) that will be 1/x divided by 1/x+1
Substitute x=2 into this 2nd equation
f(1/x): 1/2 divided by 1/2+1 = 1/2 divided by 3/2 = 1/2 * 2/3 =
1/3Now, you have to find
1/3in the answer choices:
A) f(x) = 2/3 not a match
B) - f(x) = - 2/3 not a match
C) 1/f(x) = 1 divided by 2/3 = 3/2 not a match
D) 1 - f(x) = 1 - 2/3 =
1/3 BINGO!! That's a match
E) none of the above = wrong
I hope it helps!
Thanks Ale!