Problem Solving Using the Discriminant

Math Competition Books Series -- This book introduces a powerful problem solving technique - the discriminant method. The book can be used by students preparing for math competitions such as Mathcounts, AMC 10/12/AIME.
9th book: Problem Solving Using Auxiliary Lineshttps: //www.amazon.com/dp/1975681754
10th book: https: //www.amazon.com/Problem-Solving-Using-Vietas-Theorem/dp/1542800056