Question

PLEASEE HELP!!!!

Answer 1

Start with this one: (-6,-5)

find f(-6), and find f(-5)

if f(-6) is positive, and f(-5) is negative
OR
if f(-6) is negative and f(-5) is positive,

then there is a zero between them.

Answer 2

This is why... for f to change sign, it has to cross the x-axis.. meaning there's a zero