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- Nov 7th 2009, 06:48 AM #1

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- Oct 2009
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## Need Immediate help for this question!!!

1. Given the function

**f(x) = x^3-2x,**sketch**y = f(|x|)**

2. Sketch**g(x) = |x^2-1| - |x^2-4|**

3. Sketch the region in the plane to show all points (x,y) such that**|x|+|y|<=2**

I need help understanding absolute values, cause i plugged in table of values to get y but my teacher says I have to consider the cases and regions which I don't understand. Please help asap.

- Nov 7th 2009, 08:11 AM #2

- Nov 7th 2009, 08:20 AM #3

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- Oct 2009
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I already handed it in and it was marked poorly so I need to know how to do this. Here's what I did, I plugged in 5 values of x into the equation and got five f(x) values which I used to graph it, and then my answers was matching the answer in the back of the book. However, my teacher gave me a really poor mark on it all because I didn't consider the cases and regions, which your gonna have to explain to me for these questions because I do not what she's talking about.

- Nov 7th 2009, 12:51 PM #4