Question

How do you simplify `(x^2 - 16)/(x^2 - 4x)`?

Answer 1

`(x^2-16)/(x^2-4x) = (cancel((x-4))(x+4))/(cancel((x-4))x) = (x+4)/x`

`= x/x + 4/x = 1+4/x`

With the restrictions that `x != 0` and `x != 4`