Multiply: x−4x+5⋅x+5x−4\dfrac{x-4}{x+5} \cdot \dfrac{x+5}{x-4}x+5x−4⋅x−4x+5 (assume x≠4,−5x \neq 4, -5x=4,−5).
111
x−4x+5\dfrac{x-4}{x+5}x+5x−4
(x−4)(x+5)(x+5)(x−4)\dfrac{(x-4)(x+5)}{(x+5)(x-4)}(x+5)(x−4)(x−4)(x+5)
000