In the slideshow Product Rule For Radicals, under media in Chapter 9, in order to simplify the radical, the presenter works to find of the math expressions under the radical.

Three numbers x, y, and z are in the ratio 2: 7: 8. if 12 is subtracted from y, then three numbers form a geometric sequence (in the order x, y–12, z). find x, y, and z. there are 2 sets.