Multiply: x2−9x2−x−12⋅x2−4xx−3\frac{x^2 - 9}{x^2 - x - 12} \cdot \frac{x^2 - 4x}{x - 3}x2−x−12x2−9⋅x−3x2−4x
x(x+3)x−4\frac{x(x+3)}{x-4}x−4x(x+3)
xx+4\frac{x}{x+4}x+4x
x(x+4)x+3\frac{x(x+4)}{x+3}x+3x(x+4)
x(x+3)x(x+3)x(x+3)