From the box, exactly one expression is NOT a polynomial.
List: (i) $4 x^{2} - 9 (ii) \frac{2}{x} + 3 (iii) 7$ (iv) $x^{3} - x$ .
How many of the four ARE polynomials?

Question

From the box, exactly one expression is NOT a polynomial. List: (i) 4x^2 - 9 (ii) 2/x + 3 (iii) 7 (iv) x^3 - x. How many of the four ARE polynomials?

Accepted Answer

3. (ii) 2/x = 2x^(-1) has a negative exponent, so it is not a polynomial. The other three are polynomials. Count = 3.

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