Multiply: x2−1x−2⋅x2−4x2+x\dfrac{x^2 - 1}{x - 2} \cdot \dfrac{x^2 - 4}{x^2 + x}x−2x2−1⋅x2+xx2−4 (assume x≠0,1,−1,2x \neq 0, 1, -1, 2x=0,1,−1,2).
(x+1)(x+2)x\dfrac{(x+1)(x+2)}{x}x(x+1)(x+2)
(x−1)(x−2)x\dfrac{(x-1)(x-2)}{x}x(x−1)(x−2)
x+2x\dfrac{x+2}{x}xx+2
(x−1)(x+2)x\dfrac{(x-1)(x+2)}{x}x(x−1)(x+2)