Question Simplify the expression $\frac{x^{2}+5 x-36}{x^{2}-8 x+16}$ and determine which of the following statements are true: 1) It could represent the difference of $\frac{x}{x-4}$ and $\frac{-9}{x-4}$. 2) It could represent the product of $\frac{x+9}{(x-4)^{2}}$ and $(x-4)$. 3) It could represent the sum of $\frac{a^{2}+5 a}{x^{2}-8 x}$ and $\frac{-36}{16}$. 4) It could represent the quotient of $(x-9)$ and $(x-4)$. 5) It is equivalent to the rational expression $\frac{x+9}{x-4}$.