SOLUTION: On which interval does the Intermediate Value Theorem guarantee that the polynomial x4 + 7x2 − 9x − 1 has a root?

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Question 763963: On which interval does the Intermediate Value Theorem guarantee that the polynomial x4 + 7x2 − 9x − 1
has a root?
Answer by solver91311(24713) About Me  (Show Source):
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Take each of the given intervals and test the value of the function at each end of the interval. Chose the interval where the value of the function has a different sign on one end then on the other. If one of the endpoints of an interval just happens to be a zero, discard that choice unless it is a closed interval on the end that has the zero.

John

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My calculator said it, I believe it, that settles it
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