What is 45x to the power of -3
i think but not exactly
(45x)^-3
45^-3*x^-3
45^-3=0.0000109739368999
0.0000109739368999*x^-3
This is your answer:
1/(91125 x^3)
$$45x^{-3}=\frac{45}{x^3}$$