Hello, Joker37!
State the domain and range of the following.
$\displaystyle y\:=\: \left 2\frac{1}{x^2} \right$
Why is the range greater than or equal to zero? Why isn't it (2, infinity)? The graph has $\displaystyle x$intercepts at: .$\displaystyle \left(\pm\frac{1}{\sqrt{2}},\:0\right)$
The graph of: .$\displaystyle y \:=\:2\frac{1}{x^2}$ .looks like this:
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o+o
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The graph of: .$\displaystyle y \:=\:\left2  \frac{1}{x^2}\right$ looks like this:
Code:

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          +          
* * 2 * *
* *  * *
o+o

