Answer
not a monomial
Work Step by Step
RECALL:
A monomial is a product of a constant and some variable/s whose exponents are nonnegative integers.
Using the rule $\dfrac{1}{x} = x^{-1}$, the given expression is equivalent to:
$=8 \cdot x^{-1}
\\=8x^{-1}$
The exponent of the variable is $-1$, which is not a whole number.
Thus, the expression is not a monomial.