At about the 2:07 mark, the teacher brings down a 20; he should have brought down a -20. Therefore, the remainder should be 56.
Using long division to divide polynomials
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Questions answered by this video:
How do I use long division to divide polynomials?
What does (3x^2+7x-20)Ã·(x-4) equal?
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In this lesson, the teacher shows an example of how to use long division to divide polynomials.