Polynomials

[pboland]

Which expression is not a polynomial?
a) -2x^2 + 44x - 240
b) 7/2
c) 8/19 - 2x/3
d) 5/x
I believe it is d, 5/x. Is this correct:

 

[Guest]

i would have thought it was B

 

[tkhunny]

You text book should have a definition. Does it allow x⁰? Does it allow x^-1? Does it allow x^{some fractional value}?