Which choice is the appropriate simplified form and restriction for the variable? (x+5)(x+3) 5x+15

If you would like to find the simplified form, you can do this using the following steps:
(2x - 3x^2) / (5x^3) = (x(2 - 3x)) / (x(5x^2)) = (2 - 3x) / (5x^2) if x != 0
The correct result would be (2 - 3x) / (5x^2) if x != 0.

Set square i think so