Homework Help: Math

Posted by Angie on Tuesday, April 28, 2009 at 6:43pm.

how do you factor 2c^2-7c=-5? I know that you have to change it to 2c^2-7c+5=0. Then you do this: (2c )(c ). But how do I find the two numbers? I can't think of one that works..

Math - PsyDAG, Wednesday, April 29, 2009 at 11:46am
Since 5 is a prime number, it can only be factored into 1 and 5. To add to -7, they both need to be negative. Which factor needs to be multiplied by 2 to get the sum of -7 for the middle term?

I hope this helps. Thanks for asking.
Math - Angie, Wednesday, April 29, 2009 at 3:45pm
I don't think there is any factor that can be multipl;ied by 2 to get -7..

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