PENALARAN MATEMATIS SISWA BERKEMAMPUAN TINGGI DAN RENDAH DALAM MENYELESAIKAN PERSAMAAN KUADRAT

Wahyudi Wahyudi, Purwanto Purwanto, Sri Mulyati

Abstract


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.

 Penalaran matematis merupakan proses memperoleh kesimpulan yang didukung oleh premis-premis matematis yang diketahui atau diasumsikan. Penelitian ini bertujuan untuk mendeskripsikan penalaran matematis siswa berkemampuan tinggi (KT) dan rendah  (KR) dalam menyelesaikan soal persamaan kuadrat. Subjek diminta menyelesaikan soal persamaan kuadrat dengan berbagai metode penyelesaian yang mereka kuasai dan dilakukan wawancara untuk mengklarifikasi hasil pekerjaannya. Hasil penelitian menunjukkan bahwa KT hanya memahami metode pemfaktoran dan rumus kuadratik, sedangkan KR tidak memahami metode penyelesaian persamaan kuadrat. Kedua subjek tidak memahami metode menyempurnakan kuadrat sempurna. Kedua subjek membuat dugaan, memberikan argumen dan menarik kesimpulan. Namun kedua subjek tidak memeriksa kembali hasil pekerjaannya.


Keywords


mathematical reasoning; quadratic equations; solving methods; penalaran matematis; persamaan kuadrat; metode penyelesaian

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References


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DOI: http://dx.doi.org/10.17977/jp.v1i7.6544

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