Question

if f(x)is
greater or equal to 10x–42 but less than or equal to x2+2x–26
determine limx4f(x) =

What theorem did you use to arrive at your answer?

Answer 1

I would like to know what limx4f(x) means.

Answer 2

as lim goes to 4

Answer 3

i got -2
but i don't know what the theorem is called

Answer 4

http://en.wikipedia.org/wiki/Squeeze_theorem

Not all will call this a theorem, many call it a principle.