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QUADRATIC EQUATIONS - Coggle Diagram

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- - - - When we write -(x1 +x2) instead of b/a and x1.x2 instead of c/a, we get that
        
        x^2-(x1+x2).x+x1.x2=0
        
        In other words, to write a quadratic equation which are given the roots as x1 and x2, firstly
        
        S=x1+x2 and P=x1.x2 are found. Them, it is written x^2-Sx+P=0