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#1 2008-01-25 08:13:22

tony123
Member
Registered: 2007-08-03
Posts: 189

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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