Question 1038931
Check the value of the function at each set of endpoints. 
If they're the same sign, then a zero may be in the interval, a smaller interval than you checked. 
If they're opposite in sign, then a zero is definitely in the interval.
So between 0 and 1,
{{{f(0)=-8}}}
{{{f(1)=1-3-8=-10}}}
Maybe.
Do the same for the remaining sets of endpoints.