Question

Help with precal please

Answer 1

Well have you consider pluggin in the endpoints yet

Answer 2

How can you see the endpoints

Answer 3

f is continuous on [a,b] and f(a) and f(b) have opposite signs then there exist c in [a,b] such f(c)=0.
Or if you had a<=k<=x<=d<=b and you have f(k) and f(d) are opposite in sign there there exists c in between [a,b] such that f(c)=0

Answer 4

oh the abcd?

Answer 5

[a,b]
a is the left endpoint and b is the right endpoint

Answer 6

soh for b since its -3 and 3 there is at least one zero?

Answer 7

So example
f(x)=x^3 is continuous on [-2,3]
and f(3)=3^3=27 and f(-2)=(-2)^3=-8
As you see one output is positive and the other output is negative
so there is c between -2 and 3 such that f(c)=0

Answer 8

Since f is continuous we have to connect these dots and there is no holes between -2 and 3
because again we know f is continuous on [-2,3]

As you see the graph has to cross the x-axis