x 2 - 14 x + 45. Factor completely  TOPIC_SOLVED

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x 2 - 14 x + 45. Factor completely

Postby rainyb on Sun Mar 27, 2011 4:27 am

x 2 - 14 x + 45. Factor completely ,i am lost.
Thank you
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Re: x 2 - 14 x + 45. Factor completely

Postby Martingale on Sun Mar 27, 2011 4:49 am

rainyb wrote:x 2 - 14 x + 45. Factor completely ,i am lost.
Thank you


do you know the factors of 45?
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Re: x 2 - 14 x + 45. Factor completely

Postby rainyb on Sun Mar 27, 2011 5:56 am

they are 1, 3, 5, 9, 15, and 45. but i dont understand how to work this. Help
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Re: x 2 - 14 x + 45. Factor completely  TOPIC_SOLVED

Postby Martingale on Sun Mar 27, 2011 6:10 am

rainyb wrote:they are 1, 3, 5, 9, 15, and 45. but i dont understand how to work this. Help
Thank you


don't forget the negative versions of the above numbers.... (-3)*(-15)=45

can you use two of those numbers (positive/negative) so that their product is 45 and their sum is -14?
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