<![CDATA[Mathematical reasoning is a process to obtain a conclusion that is supported by mathematical premises known or assumed. This study aimed to describe the mathematical reasoning high (KT) and low (KR) performing students in solving quadratic equations. Subjects were asked solving quadratic equations with various methods of completion they controlled and conducted interviews to clarify results of his work. The results showed KT only capable of understanding the method of factoring and the quadratic formula, while the KR is not able to understand the methods of completion of quadratic equations. Both subjects did not understand the methods completing a square. Both subjects making conjecture, provide arguments and concluding. But both the subject does not check his work.]]>
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