Question

f is continuous, f(-5) = 3 and f(-1)= -2. If f(x)=0 for one and only one value of x, which could be x?
a) -7
b) -2
c)0
d) 1
e) 2

i have no clue how to even begin answering this question. help please.

Answer 1

intermediate values guarantee the root is between -5 and -1