The discussion revolves around evaluating the limit as x approaches 4 for the expression √x - 4. Participants are exploring the implications of substituting the value directly into the expression and the resulting undefined or zero outcomes.
The conversation is ongoing, with participants questioning the necessity of certain mathematical techniques and the validity of their approaches. There is no explicit consensus on the best method to proceed, but various strategies are being considered.
Some participants express concern about obtaining a zero result and question the appropriateness of direct substitution in this context. The discussion includes references to specific mathematical concepts like conjugates and epsilon-delta proofs, indicating a focus on foundational understanding.
If I sub in 4 from the beginning, I will get sqrt 0. I can't have that as my answer.PeroK said:What exactly is the problem?
Why not?heythere1010 said:If I sub in 4 from the beginning, I will get sqrt 0. I can't have that as my answer.
I thought you would need to do something like conjugates for it.PeroK said:Why not?