X^{2} -2x=3  then 

 standard form this is ax^{2}+bx+c=o 

x^{2} - 2x - 3 = 0

the ROOT
a=2, b=-2, c=-3

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Here! Hope this helps:)
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Thank you. :)) It gives me an idea but I really can't answer my homework. You and my teacher have a different solution and when I'm trying my solution, it's really not right. :( I need to follw my teacher's solution.
Ok if that's the case, can you post your solution then so that I can see where you went wrong if you dont mind:) I'm really willing to help:)