Which of the following expressions is a polynomial?

Question

Which of the following expressions is a polynomial?
F(x)=-3x^4√x+13x^2-5x
F(x)=2/x^2-15x
F(x)=x^3-11x^2+3^x
F(x)=2x^3-5x^5-2/9x^2+9

Answer 1

A polynomial consists of variables and coefficients, that involves only addition, subtraction, multiplication, and non-negative integer exponents.

 

By that definition, we can eliminate option 1 because of the square root, and option 2 because of the division by X², and option 4 because of the division by 9X², which leaves option 3 as the only polynomial