Homework Help: precalulus

Posted by james on Friday, December 9, 2011 at 4:38pm.

use the intermediate value theorem to show that f(x) has a zero in the given interval. f(x) = -x^5 -2x^4 + 5x^3 + 4; [-0.9, -0.8]
Stuck!

precalulus - Steve, Saturday, December 10, 2011 at 5:00am
f(-.9) = -.367
f(-.8) = +.948

since f is continuous, it must assume all values between -.367 and +.948 on the interval [-.9,-.8].

That includes f(x) = 0.

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