I have an additional question if someone would please help. If so, please explain how this. I simply do not understand how the numerator changes in this case.

ExpressionSOLVED

=

The author then lists the correct LCD as . I agree with everything here except the coefficient of 12 should it not be

LCD = , where here I took the coeffecient factored out from each denominators expression and multiplied them by each other giving us a LCD of