April 24th, 2017, 04:11 PM  #1 
Senior Member Joined: Feb 2016 From: seattle Posts: 377 Thanks: 10  quadratic formula...But this time I should be getting Decimal
I tried to solve b, but guessing I got it wrong as I did not get a decimal? Thanks Last edited by skipjack; April 25th, 2017 at 12:26 AM. 
April 24th, 2017, 05:25 PM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,950 Thanks: 1141 Math Focus: Elementary mathematics and beyond 
How are you simplifying $x=\frac{1\pm\sqrt{29}}{2}$ (which should be your final answer)?

April 24th, 2017, 05:27 PM  #3 
Senior Member Joined: Sep 2015 From: USA Posts: 2,496 Thanks: 1371 
how you went from $x=\dfrac{1\pm\sqrt{29}}{2}$ to $x =15 \text{ or }x=14$ will be fascinating to hear that $29$ is under a square root sign. 
April 24th, 2017, 05:56 PM  #4 
Math Team Joined: Jul 2011 From: Texas Posts: 2,977 Thanks: 1571  
April 24th, 2017, 05:59 PM  #5 
Senior Member Joined: Sep 2015 From: USA Posts: 2,496 Thanks: 1371  
April 24th, 2017, 06:32 PM  #6 
Senior Member Joined: Feb 2016 From: seattle Posts: 377 Thanks: 10  
April 24th, 2017, 06:35 PM  #7 
Senior Member Joined: Feb 2016 From: seattle Posts: 377 Thanks: 10  Hmm okay, I guess because the line that makes me think division...plus if we are to add and  the 1 then wouldn't 29 plus equal 30 and minus 1 equal 28?

April 24th, 2017, 06:38 PM  #8 
Senior Member Joined: Feb 2016 From: seattle Posts: 377 Thanks: 10  
April 24th, 2017, 07:10 PM  #9 
Math Team Joined: Jul 2011 From: Texas Posts: 2,977 Thanks: 1571 
In exact form, the expression, $\dfrac{1 \pm \sqrt{29}}{2}$, is as simplified as it can be. Entered into a calculator, see attachment ... 
April 24th, 2017, 07:34 PM  #10 
Senior Member Joined: Feb 2016 From: seattle Posts: 377 Thanks: 10  

Tags 
decimal, formulabut, quadratic, time 
Thread Tools  
Display Modes  

Similar Threads  
Thread  Thread Starter  Forum  Replies  Last Post 
quadratic formula...But this time with a negative  GIjoefan1976  Algebra  12  January 26th, 2017 10:04 AM 
Distance time formula  Youi  Math  2  March 10th, 2016 12:26 AM 
Formula for bond price at time t  Duir  Economics  1  March 26th, 2013 07:30 PM 
Quadratic Model time to ground  kkelley  Algebra  4  June 12th, 2012 09:56 AM 
Formula for % increase of a # over time  312  Algebra  2  September 15th, 2008 03:23 PM 