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# Roots of polynomials. Watch

1. Hello, having a bit of trouble with part iv of this question. Usually for something like this question I would find an expansion to give me the terms required. For example, for part iii. I expanded (ab+by+yb)^2 and rearranged.
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2. I don't see any easy way to do it at the moment, but consider the difference of and

It looks like a lot of work though, so I guess there's a quicker way for 4 marks.
3. (Original post by Maths Magnet)
...
Consider and from part i.
4. (Original post by Maths Magnet)
Hello, having a bit of trouble with part iv of this question. Usually for something like this question I would find an expansion to give me the terms required. For example, for part iii. I expanded (ab+by+yb)^2 and rearranged.
I used GeoGebra to draw the graph and it shows that their is only one root. Are the others imaginary?
Attached Images

5. (Original post by Maths Magnet)
Hello, having a bit of trouble with part iv of this question. Usually for something like this question I would find an expansion to give me the terms required. For example, for part iii. I expanded (ab+by+yb)^2 and rearranged.
6. (Original post by MathMeister)
I used GeoGebra to draw the graph and it shows that their is only one root. Are the others imaginary?
Yes

But that is irrelevant to this type of question
7. (Original post by brianeverit)
Thanks!
8. (Original post by lazy_fish)
Consider and from part i.
I think this is the way to go.

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