Hello!

I have no idea where to post this so I'll just put it here.

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

Sorry if this is confusing, ive written it all out on paint so please open the attached file

QUESTION:

to display the graph of y=f(x) for -10<x<10, a suitable interval for y, a<x<b must be chosen. Suggest appropriate values for a and b.

I would suppose that you substitute x=-10 and x=10 to find a and b accordingly yet I cant get the right answer

Thank you!