Question

Could someone help me do this? :/ I need to use the rational root thereon

Answer 1

I just learn this staff from hartnn, yesterday.

Answer 2

Cool

Answer 3

Connection snapped.

Answer 4

\[x^3+2x^2+2x-21=0\]
so the POSSIBLE roots are going to be,\[\huge {\color{blue} {±1,±3,±7,±21} }\]

Answer 5

Plug each in, to see if it works

Answer 6

Should we pug them in together?

Answer 7

@SolomonZelman I think there is supposed to be a coefficient of 9 for the x^3 term.

Answer 8

I think I've got it, I've been re-reading the book and I think I know what I'm doing, I checked it with the answer key. Thank you for helping guys!

Answer 9

Anytime!

Answer 10

I did kind of get confused, looking over and over, and seeing that none of the numbers actually work as the roots.

Answer 11

Yes, ofcourse, coefficient of x^3 is 9.
My bad...
\(\huge {\color{purple} {Good} }\) \(\huge {\color{purple} {evening!} }\)