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# P2 functions help watch

1. The function f is given by:

1/(x^2 - 1) where x > 1

a) Find the range of f

The function g is given by:

2/x where x >0

b) Solve gf(x) = 70

I need help on these two questions. How would you go about doing these?
2. (Original post by Jubba)
The function f is given by:

1/(x^2 - 1) where x > 1

a) Find the range of f

The function g is given by:

2/x where x >0

b) Solve gf(x) = 70

I need help on these two questions. How would you go about doing these?
a)
Domain = X values
Range = Y values

b)
f(x)=1/(x^2 - 1)
g(x)=2/x
gf(x) = 70

Therefore:
gf(x)=2/(1/(x^2 - 1)) = 70
2x^2 - 2 = 70 therefore rearrange to get x^2:
x^2=36
x= -6 & +6

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Updated: June 18, 2004
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