Posted by **Gertrude** on Wednesday, August 31, 2011 at 6:04pm.

I am having a mental block. I have the answer to the question. It is

(-,). I just need help figuring it out. The equation is:

x^2+1>0

- Calculus -
**MathMate**, Wednesday, August 31, 2011 at 7:44pm
If you meant (-&infin,+&infin), your answer is correct.

1 is already >0, and x^2 is ≥0 ∀x∈R, therefore x∈R will satisfy the given inequality.

To post ∞, you can type:

& i n f i n ;

without typing the intevening spaces.

The "Microsoft Word" symbols/alt-code are not interpreted correctly here.

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