J Jake New member Aug 23, 2010 #1 (h^2 - 10h + 21) / (21 - 4h - h^2) i have gotten this far: (h - 7)(h - 3) / (-h + 3)(h + 7) how do i change the denominator to make it like the numerator so i can cancel them out? i forget how to take the negative out or whatever.
(h^2 - 10h + 21) / (21 - 4h - h^2) i have gotten this far: (h - 7)(h - 3) / (-h + 3)(h + 7) how do i change the denominator to make it like the numerator so i can cancel them out? i forget how to take the negative out or whatever.
