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June 4th, 2010, 01:14 PM  #1 
Newbie Joined: Jun 2010 Posts: 12 Thanks: 0  Need help using quad formula to solve
Solve S=2t^2+kt for t. I am not thinking any more because my brain is fried.

June 4th, 2010, 01:44 PM  #2 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,538 Thanks: 920 Math Focus: Elementary mathematics and beyond  Re: Need help using quad formula to solve
Complete the square.

June 4th, 2010, 02:17 PM  #3 
Newbie Joined: Jun 2010 Posts: 12 Thanks: 0  Re: Need help using quad formula to solve
Thanks!

June 4th, 2010, 02:23 PM  #4 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,538 Thanks: 920 Math Focus: Elementary mathematics and beyond  Re: Need help using quad formula to solve
You could also use 2t^2 + kt  S = 0 and apply the quadratic formula.

June 4th, 2010, 02:54 PM  #5 
Newbie Joined: Jun 2010 Posts: 12 Thanks: 0  Re: Need help using quad formula to solve
I went with the quadratic I don't know how to make the math symbols on here so here goes: t=k+orthe sq rt of k^2+8S over 4? 
June 4th, 2010, 02:56 PM  #6 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,538 Thanks: 920 Math Focus: Elementary mathematics and beyond  Re: Need help using quad formula to solve In general, the quadratic formula for ax^2 + bx + c = 0 is 
June 4th, 2010, 02:59 PM  #7 
Newbie Joined: Jun 2010 Posts: 12 Thanks: 0  Re: Need help using quad formula to solve
Yep, that's it! Thank you so much!

June 4th, 2010, 03:01 PM  #8 
Newbie Joined: Jun 2010 Posts: 12 Thanks: 0  Re: Need help using quad formula to solve
Wait. I got positive 8S. What did I do wrong. 4ac is 4(2)(S)... yes?

June 4th, 2010, 03:05 PM  #9 
Global Moderator Joined: Oct 2008 From: London, Ontario, Canada  The Forest City Posts: 7,538 Thanks: 920 Math Focus: Elementary mathematics and beyond  Re: Need help using quad formula to solve You are correct!

June 4th, 2010, 05:02 PM  #10 
Newbie Joined: Jun 2010 Posts: 12 Thanks: 0  Re: Need help using quad formula to solve
Great!


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