(x + 2) / (x - 4) divide by (1) / (3x - 12)
you can switch between multiply and divide if you flip the fraction on the right
(x + 2) / (x - 4) times (3x - 12) / (1)
multiply the tops of each fraction together and the bottoms of each fraction together
(x + 2)(3x - 12) / (x - 4)(1)
factor a 3 out of 3x-12 and remove the (1) since it doesn't change anything
3(x + 2)(x - 4) / (x - 4)
cancel the x-4 since it's on the top and bottom
Answer: 3(x+2)