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#1 2008-01-25 08:13:22
- tony123
- Member
- Registered: 2007-08-03
- Posts: 230
x∈ [-5,4]
If
x∈ [-5,4]
then x² ∈ [.......,....]
and 1/x ∈ .........
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#2 2008-01-25 09:00:31
- mathsyperson
- Moderator
- Registered: 2005-06-22
- Posts: 4,900
Re: x∈ [-5,4]
x² ∈ [0,25]
1/x ∈ (-∞,-1/5] U [1/4,∞)
Why did the vector cross the road?
It wanted to be normal.
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