February 17th, 2018, 07:11 PM  #11 
Global Moderator Joined: Dec 2006 Posts: 18,702 Thanks: 1527 
Squaring gives $x^2 + 4x + 4 = x^2 + 14x + 49$, i.e. $10x + 45 = 0$, so $x = 9/2$. Why would that be wanted as an interval? Was the question mistyped? 
February 17th, 2018, 07:19 PM  #12 
Math Team Joined: Dec 2013 From: Colombia Posts: 7,232 Thanks: 2411 Math Focus: Mainly analysis and algebra  
February 19th, 2018, 10:26 AM  #13  
Math Team Joined: Jan 2015 From: Alabama Posts: 2,966 Thanks: 807  Quote:
That's why romsek divided this into three regions, $x< 7$, $7\le x< 2$, and $2\le x$. In the first region x is less than both 7 and 2, in the second, x is larger than 7 but still less than 2, and in the third, x is greater than both 7 and 2.  

Tags 
calculus, equation, math or calculus, trigonometry or algebra, urgent 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
need help with reduction of equation (urgent)  moazad655  Algebra  2  October 28th, 2014 01:27 PM 
how to solve the equation  urgent and important  junjie  Algebra  12  November 4th, 2012 04:30 AM 
URGENT! Help me find the equation of this log graph  RolloJ  Applied Math  1  October 23rd, 2008 10:58 AM 
Riccati Equation  URGENT  balex  Calculus  1  September 16th, 2007 01:35 PM 
how to solve the equation  urgent and important  junjie  Complex Analysis  10  December 31st, 1969 04:00 PM 