## anonymous one year ago .

1. anonymous

i wanted to know how to do it though but i'll just work backward

2. anonymous

@Loser66

3. anonymous

@Astrophysics

4. Astrophysics

You can use the rational zero theorem, where you look at your last term and your first term, so we have $\frac{ \text{factors of 20} }{ \text{factors of 1} }$

5. Astrophysics

I think that's a pretty easy way to do it :), so list your factors but remember there are positive and negative terms.

6. Astrophysics

So since it's a polynomial we can treat the first term as P and last term as Q$\frac{ P }{ Q } = \frac{ \text{factors of 20} }{ \text{factors of 1} }$ so just a nicer way of putting it.

7. Astrophysics

So what are the factors of 20?

8. anonymous

20 and 1, 2 and 10, 4 and 5

9. OregonDuck

come on human calculator XD

10. Astrophysics

Factors of 20 are 1,2,4,5,10,20 so you got that :) now what are the factors of 1

11. anonymous

1

12. Astrophysics

But remember it's positive and negative!

13. anonymous

so 1 and 1, -1 and -1

14. Astrophysics

So we have $\frac{ P }{ Q } = \pm \frac{ 1,2,4,5,10,20 }{ 1 } = \pm 1,2,4,5,10,20$ :)

15. Astrophysics

Easy peasy right?

16. anonymous

yup. Is that positive negative for all of them?

17. anonymous

so the answer is c, right?

18. Astrophysics

Yup! This $\pm$ indicates it has a positive value and negative, and yup that sounds good!

19. anonymous

i fanned you, you are awesome!

20. Astrophysics

Haha, thanks! It's always fun to learn with people!