Question

Which of the following expressions are polynomials?
(i) $x^2+4$
(ii) $4-x^{-1}$
(iii) $2x^2-\frac{2}{x}$

• A. (i), (ii), (iii)
• B. (i)
• C. (ii), (iii)
• D. (iii)

Answer 1

The correct option is B

(i)

An expression containing one or more terms with non-zero coefficient where the variables have whole number exponents is called a polynomial.
Hence polynomials cannot have variables with exponents as negative integers. So, (ii) and (iii) are not polynomials as the variable 'x' has negative exponents.