
Radical Equations #2
http://puu.sh/3kESP.png
my attempt: I divide everything by 2 so that I end up with
http://puu.sh/3kEUu.png
http://puu.sh/3kEWZ.png
http://puu.sh/3kEYv.png
I then use quadratics formula and results are: http://puu.sh/3kEZJ.png
The answer is suppose to be n = 4, what did I do wrong?

Re: Radical Equations #2
Hey Mathnood768.
Hint: n^2  7 = (7n)^2 not (7n^2).

Re: Radical Equations #2
oh, I typed it in wrong, that's what I meant. You end up with http://puu.sh/3kEYv.png with n^2  7 = (7n)^2

Re: Radical Equations #2
Now try collecting terms and simplifying to get a value of n (use the quadratic formula).

Re: Radical Equations #2
well u did a basic mistake....
n^2 term cancels on both sides yielding 14n56 =0 that is n=4 which is reqd. answer...