Question

Which of the following expressions is a polynomial?
A)f(x)=-2.1x^7+3x^2+17/2x
B)f(x)=1/5x^2+4.5x+2^x
c)f(x)=4/x-11x^2
df(x)=-3x^4+8x^2-2√(x)+1

Answer 1

polynomials CANNOT have
1. variables in the exponent
2. variables in the denominator
3. radicals, aka square roots of variables

Answer 2

Ok so that eliminates B C D leaving A, correct?

Answer 3

yes

Answer 4

Thanks :)