Question

3x cubed plus 8x squared minus 8x plus 8. Find the zeroes using the rational root theorem.

Answer 1

\[3x^3+8x^2+8x+8=0\]?

Answer 2

Yes that's it.

Answer 3

1 does not work
-1 does not work
2 does not work
-2 does though

Answer 4

Oh wait it's minus 8x, not plus.

Answer 5

actually it is pretty clear that if there is a zero, it cannot be positive, because all the coefficients are positive

Answer 6

well that is a horse of a different colour

Answer 7

Okay but i have tried a bunch of others that are negative and they haven't worked.. I know but i really need to get it done for extra credit!

Answer 8

lets check and see if it has a rational zero, it certainly is possible that it does not

Answer 9

either there is a typo in the question, or you can forget finding a rational zero
http://www.wolframalpha.com/input/?i=3x^3%2B8x^2-8x%2B8%3D0

Answer 10

I'll check the problem again, but as i was walking out of the class my teacher said our clue was to use the quadratic equation

Answer 11

Typo again. minus 8x squared and minus 8 x