just one more and im done so ln sqrt(x+4) = 1 = e^1 = sqrt(x+4)...square both sides e^2 = x+4 e^2-4 = x now I need to solve by hand in exact form. Is this as far as I can go?
Follow Math Help Forum on Facebook and Google+
Originally Posted by RYdis just one more and im done so ln sqrt(x+4) = 1 = e^1 = sqrt(x+4)...square both sides Get rid of that first equals sign e^2 = x+4 e^2-4 = x now I need to solve by hand in exact form. Is this as far as I can go? Yes, this is the answer in exact form. The only thing you might be able to do is factorise the LHS using Difference of Two Squares...
Originally Posted by Prove It Yes, this is the answer in exact form. The only thing you might be able to do is factorise the LHS using Difference of Two Squares... (e-2)(e+2) = x? since squares can't be negative..does this leave just e+2 = x instead of e+2 = x or e-2 = x. should I just leave as the difference?
Originally Posted by RYdis (e-2)(e+2) = x? since squares can't be negative..does this leave just e+2 = x instead of e+2 = x or e-2 = x. should I just leave as the difference? No, x = (e-2)(e+2). You can't go any further.
Originally Posted by Prove It No, x = (e-2)(e+2). You can't go any further. awesome, thanks for help, starting to get it now.
Last edited by mr fantastic; Oct 20th 2011 at 05:44 AM. Reason: Moved a new question to a new thread.