Question

Use intermediate value theorem to show that the polynomial function has a zero in the given interval.
f(-3)=
value of 0=

Answer 1

for a given interval I=[a,b], if for any x1,x2 in I, if the sign of f(x1) is different from the sign of f(x2), then there has to be some point (c) in between x1 and x2 where f(x)=0

Answer 2

in other words, if you start on one side of the street, and end up on the other side of the street; somewhere along the way you had to cross the street.