Question

When evaluating limits, when can we substitute the limit value in, or when shouldn't we?

Answer 1

once u simplify ur limit, it'll be easier to explain if u gave an example

Answer 2

when the equation can't be simplified anymore and is 0/0 form or 1/0 form.

Answer 3

when you plug in the limit value.

Answer 4

I mean in any question asking us to evaluate limits, should we always substitute first before doing anything else?

Answer 5

yeah always substitute when you get a answer that equals to 1/0 or 0/0 then simplify if you can and then try to plug it in again if you still get the same answer then limit does not exist.

Answer 6

if u can simplify or cancel anything out, do it, then plug in the limit value

either way works, but if u get infinity limits, thats where u cant do direct substitution (sometimes)

Answer 7

when the function is continuous at that value