Question

Which expression is NOT a polynomial?

Answer 1

`4x^2+(5)/(x) -6`

Explanation:

A rule for polynomials, is that if they have variables, the powers should be positive whole numbers. Basically, this means you cannot divide by a variable, but in option 4, second term, you are dividing 5 by x, which is the same as
`5*x^(-1)`. This means you are not raising the variable to a positive power, which means the whole 4th option is not a polynomial.

Answer 2

The last expression.

Explanation:

The last expression is not a polynomial because x is in the denominator of the second term.