How do you use the intermediate value theorem to show the polynomial function that has a zero in the given. [1.3, 1.9], f(x)= x^5-x^4+3x^3-4x^2-16x +15

f(1.3)=-5.112 (approx.)
f(1.9)=2.465 (approx.)
the theorem tells us that since there is a sign change for f on the interval there must be a zero on the interval