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For example, I have:

CharacteristicPolynomial[m, x]
0.5 + 0.1 x + x^2

But

Plot[CharacteristicPolynomial[m,x], {x,-1, 1}] 

gives errors.

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marked as duplicate by Kuba, Artes, Sjoerd C. de Vries, belisarius, Yves Klett Nov 15 '13 at 13:01

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2  
Plot has HoldAll attribute so you need to Evaluate it first or add the option , Evaluated -> True. –  Kuba Nov 15 '13 at 9:34
1  
I think it should be marked as a duplicate of Evaluate or not or expression evaluation in Plot. –  Kuba Nov 15 '13 at 9:43
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