Friday

December 19, 2014

December 19, 2014

Posted by **Erika** on Sunday, September 28, 2008 at 3:41pm.

f(x) = x^2 - 1, g(x) = x/x + 2

Why is the followig the equation of (g o f)(x)

THe answer is x^2 - 1 / x^2 + 1

This is how I got the answer with someone's help:

Assume you forgot parenthese

g(x) = x / (x + 2)

g = x^2 - 1) / (x^2 - 1 + 2)

= (x^2 - 1)/(x^2 + 1)

Is there a simpler way to get the answer?

Thank you for any further assistance

- calculus ( Is there a simpler way to get answer?) -
**drwls**, Sunday, September 28, 2008 at 4:45pmI can't think of a better way to do it than your example.

g(x) = x/(x+2)

g[f(x)] = (x^2-1)/(x^2-1 +2)

= (x^2-1)/(x^2+1)

**Answer this Question**

**Related Questions**

Calculus - Both x and y denote functions of t that are related by the given ...

Calculus - We're learning about different kinds of functions and I don't really ...

calculus - given the functions: f(x) = x^2 - 1, g(x) = x/x + 2 Why is x^2 - 1/x^...

Calculus - Find the sum and difference functions f + g and f – g for the ...

calculus - hi! is there a way to find the local and absolute extreme values of ...

physics - Given that x=Acos(wt) is a sinusoidal function of time, show that v(...

Calculus - Math questions, please help me? :(? Find the composite functions f o ...

Math - I am not exactly sure of what I'm supposed to do in the following ...

composite functions - f(x)=2x-4, g(x)=x squared + 5x What is F o G and Domain ...

Math - The average of X numbers is 15. If the sum of the X numbers is 90, what ...