Double-Check My Problem Solving | Correct Reasoning Verification

[Albert Einstein1]

I am not entirely sure if I solved this problem correctly. Please let me know if my reasoning is flawed. Thank you and I appreciate your help greatly.

 

[Prove It]

The function is continuous, just substitute x = 0...

 

[Prove It]

On second thought, I didn't read the question properly... Please disregard my previous post.

 

[HOI]

The function IS continuous at x=0 but you need to show that $\lim_{x\to 0} f(x)= 1$ to show THAT so continuity cannot be used to do this exercise.

Albert, you state that $-1\le x^2- 2\le 1$. That is the same as $1\le x^2\le 3$. If x is close to 0 that is NOT true! You also have $\lim_{x\to 0} -x^2= 1$ and $\lim_{x\to 0} x^2= 1$. Those are certainly not true! Did you mean "= 0"?