If you write the quadratic so that the squared term has coefficient 1, then the product of the roots = the constant term and the sum of the roots with the sign changed = the coefficient of the x term.
Beyond that the only way I know to tell you is that you must practice until you get the hang of it. Start by writing the product of 2 binomials (FOIL) and then try your hand at factoring. Get an algebra book and do all the "factoring" problems until you "get it."
Oh, maybe there is one trick. Do you know the quadratic formula? If not, look it up. Since it always gives you the roots of the equation, you can use it to get your factors if you are really stuck. If this explanation isn't sufficiently helpful, send me a message and I will try to help further.
P.S. You also need help with English grammar: A sentence begins with a capital letter and ends with a period. A question also begins with a capital letter and ends with a question mark. You expect precise answers from a tutor; as a tutor I expect precise and clear questions from a student!
