>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_equationActually there are two valid values for x, 40 and -60. Try the equation Boris pointed to with a = 1, b = 20 and c = -2400
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