To solve the given fraction, we have to multiply the extremes parts and the inner parts between each other.
[tex]\frac{x(x^2-9)}{x^2(x-3)}[/tex]
Then, we factor the numerator
[tex]\frac{x(x+3)(x-3)}{x^2(x-3)}[/tex]
At last, we simplify
[tex]\frac{x+3}{x}[/tex]
Hence, the answer is the third option.
