How many continuous real-valued dunctions f are there with domain [-1,1] such that (f(x))^2 = x^2 for each x in [-1,1] ?
A) 1
B) 2
C) 3
4) 4
E) inf.
I thought of f = x, -x, |x|
any other ?
could it be |-x| ?
GR9768 Q 50
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- Posts: 27
- Joined: Tue Apr 06, 2010 8:22 am
Re: GR9768 Q 50
almost - just wth minus outside of the abs
f = - |x|. that will do.
