Question

Which among the following is a polynomial in one variable?

• A. $4x^{\frac{3}{2}}$
• B. $2x^{\pi }$
• C. $y^{-2}$
• D. $4x$

Answer 1

The correct option is D $4x$

In the given expressions, the exponents of the variables are $\frac{3}{2}$, $\pi$, -2 and 1 respectively.

Out of these numbers, only 1 is a whole number, and it is the exponent of the variable $x$ in $4x$.

Thus, only $4x$ is a polynomial.