precalulus
posted by james .
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!

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.