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 June 4th, 2010, 02:14 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, 02:44 PM #2 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,697 Thanks: 977 Math Focus: Elementary mathematics and beyond Re: Need help using quad formula to solve Complete the square.
 June 4th, 2010, 03:17 PM #3 Newbie   Joined: Jun 2010 Posts: 12 Thanks: 0 Re: Need help using quad formula to solve Thanks!
 June 4th, 2010, 03:23 PM #4 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,697 Thanks: 977 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, 03:54 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+or-the sq rt of k^2+8S over 4?
 June 4th, 2010, 03:56 PM #6 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,697 Thanks: 977 Math Focus: Elementary mathematics and beyond Re: Need help using quad formula to solve $t\,=\,\frac{-k\,\pm\,\sqrt{k^2\,+\,8S}}{4}$ In general, the quadratic formula for ax^2 + bx + c = 0 is $x\,=\,\frac{-b\,\pm\,\sqrt{b^2\,-\,4ac}}{2a}$
 June 4th, 2010, 03:59 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, 04:01 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, 04:05 PM #9 Global Moderator     Joined: Oct 2008 From: London, Ontario, Canada - The Forest City Posts: 7,697 Thanks: 977 Math Focus: Elementary mathematics and beyond Re: Need help using quad formula to solve You are correct!
 June 4th, 2010, 06:02 PM #10 Newbie   Joined: Jun 2010 Posts: 12 Thanks: 0 Re: Need help using quad formula to solve Great!

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