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Problem Solving Using the Discriminant, Paperback by Chen, Yongcheng, ISBN 1542426510, ISBN-13 9781542426510, Brand New, Free shipping in the US Math Competition Books Series -- This book introduces a powerful problem solving technique - the discriminant method. Th can be used by students preparing for math competitions such as Mathcounts, AMC 10/12/AIME. 9th book: Problem Solving Using Auxiliary Lines 10th book:
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