How do you use the rational root theorem to find the roots of $r(x) = 5t^3 – 8t^2 + 7t + 2$ ?

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Answer 1 · 2015-09-11T16:57:40

You can't. It has no rational roots.

You can list the possible rational roots, they are

$+-1, +-2, +-1/5, +-2/5$

None of the is a zero (check each of them to see this.).

How do you use the rational root theorem to find the roots of r(x) = 5t^3 – 8t^2 + 7t + 2r(x) = 5t^3 – 8t^2 + 7t + 2?