Polynomials, Negative Exponents.

-15x^4 / 3x^9

There are no negative exponents in the question. An exponent is a power.

= (-15/3) * ( x ⁴/x ⁹)

= -5 * (1/x ⁵)

= -5 / x ⁵

OR

= (-15/3) * ( x ⁴/x ⁹)

= -5 * x ^-5

= -5 * (1/x ⁵)

= -5 / x ⁵