Question 1153869
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The key to solving this problem is the Remainder theorem, as tutor @greenestamps showed to you in his post.


If you do not know this theorem,  you will  NEVER  solve this problem.
You even will never know how and where to start (!)


But, &nbsp;in opposite, &nbsp;if you &nbsp;<U>DO &nbsp;KNOW &nbsp;the theorem</U>, &nbsp;then you will be able to solve this 
and hundreds other similar problems, &nbsp;that otherwise, &nbsp;you think, &nbsp;seem to be unsolvable, &nbsp;from the first glance &nbsp;(!)



To learn about the Remainder theorem and to see many other nice problems, &nbsp;solved with it, &nbsp;look into the lessons

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Polynomials-and-rational-expressions/Divisibility-of-polynomial-f%28x%29-by-binomial-x-a.lesson>Divisibility of polynomial f(x) by binomial x-a and the Remainder theorem</A>

&nbsp;&nbsp;&nbsp;&nbsp;- <A HREF=https://www.algebra.com/algebra/homework/Polynomials-and-rational-expressions/Solved-problems-on-the-Remainder-theorem.lesson>Solved problems on the Remainder thoerem</A>

in this site.



Also, &nbsp;you have this free of charge online textbook in ALGEBRA-II in this site

&nbsp;&nbsp;&nbsp;&nbsp;<A HREF=https://www.algebra.com/algebra/homework/complex/ALGEBRA-II-YOUR-ONLINE-TEXTBOOK.lesson>ALGEBRA-II - YOUR ONLINE TEXTBOOK</A>.


The referred lessons are the part of this online textbook under the topic 
"<U>Divisibility of polynomial f(x) by binomial (x-a). The Remainder theorem</U>".


Save the link to this online textbook together with its description


Free of charge online textbook in ALGEBRA-I
https://www.algebra.com/algebra/homework/quadratic/lessons/ALGEBRA-I-YOUR-ONLINE-TEXTBOOK.lesson


to your archive and use it when it is needed.