Question 1051064
{{{3(-3)^3+7(-3)^2+3(-3)+7=-81+63-9+7=-20}}}
{{{3(-2)^3+7(-2)^2+3(-2)+7=-24+28-6+7=5}}}
Since the function value goes from -20 to 5 in the interval between -3 and -2, there must exist a value of x between -3 and -2 where the function equals zero.