Discussion
| (A) | -9 - 4√5 |
| (B) | ... |
| (C) | ... |
| (D) | ... |
| (E) | ... |
| (F) | ... |
The solution is
Posted: 01/13/2013 14:10
Hi, I'm not sure why you multiply by 2+ square root 5.
Posted: 01/13/2013 14:28
Hi Kristie, it's so that we can take advantage of the algebraic identity: a^2 - b^2 = (a-b)(a+b), and simplify the terms of the fraction, as worked out in the explanation.
Posted: 01/13/2013 14:58
Thank you