I am currently reviewing my whole algebra textbook for a CAT6 test on tuesday. Apparently, it is very difficult, so I'm taking every minute to review. Anywho, I ran into 3 problems that are currently driving me crazy. :tongue: One concerns roots. Here is the problem the book presents: (6x2x)x1/2 My answer was (36x3)1/2. But the book says the answer is (6x)5/2 BTW, how do you write root signs using the latex program? another root problem: y3/y1/4 My answer was x3/4. The book says x11/4 is the answer. Now, here is a factoring problem: -4(x+16)4 + 9(x+16)2 + x + 16 On this problem, the part that confuses me is the answer: [-4(x+16)3 + 9x + 145) (x+16) I arrived at this answer on my own, except I went one step further: when I got to [-4(x+16)3 + 9x + 145) (x+16) , I went ahead and rewrote (x+16)3 as (x+16)(x+16)2 so that I could distribute the -4. I then arrived at (x+16)3 (5x+81). Apparently, my final step was incorrect. I would like to know why. Also, I did most of these operations in my head (as it is easier for me to do so), so if you would like me to explain anything that I did, I should point out that I may sound unmathematical in a sense. Thank you for your time.