January 23rd, 2016, 07:33 AM  #1 
Newbie Joined: Jan 2016 From: uk Posts: 2 Thanks: 0  Please help
x + 3^x < 4 I tried logarithms but couldn't get a solution. Could anyone show me their method? Last edited by skipjack; January 23rd, 2016 at 09:19 AM. 
January 23rd, 2016, 08:11 AM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,963 Thanks: 1148 Math Focus: Elementary mathematics and beyond 
$x+3^x$ is strictly increasing, so $x+3^x<4$ when $x<1$.

January 23rd, 2016, 08:42 AM  #3 
Newbie Joined: Jan 2016 From: uk Posts: 2 Thanks: 0 
Thanks man.
