Question

X^2 - 9x +20 / x^2 - 4x

Answer 1

Using parentheses here would make your post much clearer. I am assuming that you meant:

X^2 - 9x +20

-------------------- but this is not the only possible interpretation.

x^2 - 4x

Factoring, we get:

(x-4)(x-5)

---------------------

x (x-4)

Reduce this by cancelling the two (x-4) multipliers:

x-5

------ This is the final answer in most simplified form.

x