R Red New member Joined Sep 30, 2006 Messages 7 Oct 1, 2006 #1 log x + log (x + 15) = 2 I know that you use the multiplication property but how do I factor the log?
log x + log (x + 15) = 2 I know that you use the multiplication property but how do I factor the log?
skeeter Elite Member Joined Dec 15, 2005 Messages 3,204 Oct 1, 2006 #2 log x + log (x+15) = 2 log[x(x+15)] = 2 change to an exponential equation ... x(x+15) = 10<sup>2</sup> x<sup>2</sup> + 15x - 100 = 0 solve for x ... don't forget to check each solution in the original equation, one might not work.
log x + log (x+15) = 2 log[x(x+15)] = 2 change to an exponential equation ... x(x+15) = 10<sup>2</sup> x<sup>2</sup> + 15x - 100 = 0 solve for x ... don't forget to check each solution in the original equation, one might not work.
