Question

Which of the following expressions are polynomials?
(i) $x^2+4+y^3$
(ii) $4-x^{-1}+z^3$
(iii) $2x^2-\frac{2}{x}$

• A. $x^2+4+y^3$ , $4-x^{-1}+z^3$ and $2x^2-\frac{2}{x}$
• B. $x^2+4+y^3$
• C. $4-x^{-1}+z^3$ and $2x^2-\frac{2}{x}$
• D. $2x^2-\frac{2}{x}$

Answer 1

The correct option is B

$x^2+4+y^3$

Polynomials cannot have variables with exponents as negative integers. So, (ii) and (iii) are not polynomials as the variable 'x' has negative exponents.