Use Descartes' rule of signs to describe possible combinations of roots for the polynomial.... Pre-CAL?

h(x)=2x^3+5x^2-31x-15

Anonymous2015-04-21T11:20:21Z

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h(x) has 1 sign change, so there is 1 positive root.
h(-x) = -2x^2 + 5x^2 + 31x - 15 (odd terms switch signs) has 2 sign changes, so there are 2 or 0 negative roots.

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