Use the formal definition of limits

[Student4]

Homework Statement

Use The Formal definition of limits to show

Homework Equations

The Formal definition of limits

The Attempt at a Solution

Tried to do it like this, but that was wrong. What do i need to do different?

 

[vela]

What you wrote has little resemblance to a proof. A proof is an argument showing that some statement is true. First, you should identify what statement it is you're trying to prove. Second, and this is key, you need to write a coherent argument where it's logically clear how you started from the givens and reached the conclusion.

You may find this video helpful: