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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?

 Dec 1, 2022
 #4
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After division your left with  x(10 - a) + 6(13 - a) - 15, so a = 10.

 Dec 2, 2022

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