Hi guys. I have a question regarding the epsilon-delta proof you provided, on example 3.
Here's a snippet:
Example 3. ....... we will replace |x+5| by a number M which satisfies . In so doing, we rewrite as
and proceed as before taking
My question is regarding the M. If M is |x+5|,
how do you conclude that |x+5||x-5| |x-5|M < .
I would think the opposite. Since M is greater than |x+5|, then |x-5|M might actually be greater than epsilon!
For example: let's say x=9, epsilon = 58, M = 15
so we get |14||4| = 56 < 58,
however, |4| times 15 = 60 > 58!
Hopefully, you understand what I'm trying to say. Can someone please help?