>>Now I'm really confused because I know X=40 so...?
>>
>>>>How do you solve for x in the equation X*(X+20)=2400
>>>>
>>>>Thanks
>>>>Jon
>>>
>>>X*(X+20)=2400
>>>X*X + 20*X = 2400
>>>X*X + 20*X - 2400 = 0
>>>And that is a typical Quadratic equation :-)
>>>
>>>http://en.wikipedia.org/wiki/Quadratic_equation
>
>
>Actually there are two valid values for x, 40 and -60. Try the equation Boris pointed to with a = 1, b = 20 and c = -2400

Guess your right either would work. This came from my son's math book with the question:

"The product of 2 numbers is 2400 one number is 20 more than the other"

So that's the equation I came up with. Maybe I'm over complicating the question but it seems correct. Its a 4th grade math book for crying out loud, so could it really be a "Quadratic equation" :)

Thanks
Jon