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I'm trying to learn to factor polynomials, and I'm trying to graph

$30x^5 – 166x^4 – 542x^3 + 2838x^2 + 1520x – 800$

from here on Purplemath.

When I graph polynomials on my NSpire CS CAX or here it doesn't match up with what the picture gives. What am I doing wrong?

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    What PurpleMath gave was right. Check http://s$n$ipurl.com/$2$3bm97v2012-05-01

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You should probably set Y-min to –1000 and Y-max to 10000 or something like that. That's most likely the problem, but I'm not completely sure because I can't see what you've done exactly.