M Mac_dw New member Joined Apr 28, 2006 Messages 12 Apr 28, 2006 #1 Xsquared = 15 I'm not sure whether to square root both sides (X= square root 15) or whether to subtract 15 from both sides then add a 0X (to make it a trinomial) and then use Quadratic equation where A=1, B=0, C=-15 Please Help???
Xsquared = 15 I'm not sure whether to square root both sides (X= square root 15) or whether to subtract 15 from both sides then add a 0X (to make it a trinomial) and then use Quadratic equation where A=1, B=0, C=-15 Please Help???
tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 11,325 Apr 28, 2006 #2 The quadratic formula is more reliable. It will remind you to find BOTH solutions. Using the square root, you must remember this yourself.
The quadratic formula is more reliable. It will remind you to find BOTH solutions. Using the square root, you must remember this yourself.
M Mac_dw New member Joined Apr 28, 2006 Messages 12 Apr 28, 2006 #3 so will the answer end up being the same either way???
tkhunny Moderator Staff member Joined Apr 12, 2005 Messages 11,325 Apr 29, 2006 #4 Only if you remember. Unique solutions don't care how you find them. That's why they are called "unique".
Only if you remember. Unique solutions don't care how you find them. That's why they are called "unique".
