Question

PLEASE HELP ME!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
I WILL AWARD MEDAL!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

When asked to find the zeros of the function r(t) = 5t^3 – 8t^2 + 7t + 2 which task would you complete first - Rational Root Theorem or Descartes’ Rule of Signs? Use complete sentences to explain your reasoning.

Answer 1

@Loser66 @Mertsj

Answer 2

hi their @satellite73

Answer 3

not sure why there is a choice
only possible rational roots are \(1,2,\pm\frac{1}{5}, \pm\frac{2}{5}\)so maybe try those first
on the other hand since this has two changes in sign, there are either 2 or no positive real zeros
i never knew you were supposed to choose between the methods though

Answer 4

I do not understand.

Answer 5

to me, I will choose the rational root theorem to do first because the question is " find the zeros of the functions". If they ask " how many real, imaginary roots?" then I choose Decarte rule.
Got what I mean?

Answer 6

Yes I do.

Answer 7

ok

Answer 8

@satellite73 @Loser66

Answer 9

what is the question? the posted one was solved, right? so??

Answer 10

No it was not solved?
Or that is what I think.

Answer 11

I gave you mine which included the explanation why I choose that method, is it not an answer?

Answer 12

Oh but it also asks for the zeros? Am I wrong.

Answer 13

the question just asked about which method do you choose to solve, not about the roots. If the second part is " find the roots" then satelite73 gave you all of them.

Answer 14

Oh ok I misunderstood the answer thank you.

Answer 15

yw