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When x^4+6x^3-ax^2-45x-15 is divided by x^2-x-6 the remainder is 3. What is a?

 

I'm really confused, and please show all the steps you took to solve this... I would really like to  know for future similar problems!! :)

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 Feb 23, 2020
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Have you tried long division?

 Feb 23, 2020

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