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September 11th, 2008, 05:55 AM  #1 
Newbie Joined: Sep 2008 Posts: 1 Thanks: 0  Solve Quadratic Equation for x
Hi I am trying to solve the following equation for x: 8.64 = 0.0033x2 + 0.2496x + 4.2041 I'm not exactly sure how to proceed with this. Would I first subtract 8.64 from both sides so that one side can be set to 0? Thanks Peter 
September 11th, 2008, 12:46 PM  #2  
Global Moderator Joined: May 2007 Posts: 6,556 Thanks: 600  Re: Solve Quadratic Equation for x Quote:
 
September 11th, 2008, 02:23 PM  #3 
Senior Member Joined: Jul 2008 Posts: 895 Thanks: 0  Re: Solve Quadratic Equation for x
Actually, there are several steps possible, each of which could be "first". If so unsure, you might want to first brush up on some simpler examples from your text. If it is allowed, I can upload a small spreadsheet I did a long time back for generating practice problems [ and answers.] It's completely free to use/change as you wish. I did a number of them on different topics just for fun. The platform can be Excel or OpenOffice. My own instinct would be to first multiply to get rid of decimals. My second impulse would be to rearrange to have x^2 coefficient positive. That's not critical, just force of habit just as we use rectangular coordinates at times when we really don't have to. 
September 11th, 2008, 10:15 PM  #4  
Global Moderator Joined: Dec 2006 Posts: 19,287 Thanks: 1681  Quote:
 

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