Looks so simple yet my class couldn't figure it out, Reddit r/askmath

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[HalobeatWatcher]

Honestly I think the class didn’t learn limit from right and left or they just forget about it.

[wtmayhew]

This limit problem is a good illustration of why making even a rough sketch graph of the function in question can shed a lot of light. Using a graphing as a qualitative analytical tool is too often overlooked.

[henrikholst]

Note to self:
"L'Hôpital's rule can only be applied in the case where direct substitution yields an indeterminate form, meaning 0/0 or ±∞/±∞. So if f and g are defined, L'Hôpital would be applicable only if the value of both f and g is 0. "

[cvkline]

Cady Heron would have figured this out… it’s how she won the athlete competition in “Mean Girls.”

[Stags]

I used to love asking my students on these if their denominator was positive zero or negative zero. The transition from initial confusion to a-ha was one of my favorite gems from teaching.

[joaooliveirarocha]

I just woke up and this video was suggested. I haven't touched in limits for almost a decade so my thought was "Ive forgetten all of this".
I've opened the video, watched for 3 minutes and I could feel the knowledge coming back 😂 so weird

[houghwhite]

I haven't been to school for at least 5 years, and now listening to your explanation I could understand better what I could not back then

[bobtivnan]

Knowing how this function's graph behaves gives all of the intuition needed. Vertical asymptote at x=1, positive to the right, negative between 0 and 1. My students often dive into the calculus without thinking about the precalculus. Sure it can be done without the precalc, but the confidence gets a big boost when we think about the graph first.

[contextinvideos]

never took a calculus class in my life but i still end up watching these videos

[johnelectric]

Thank you. The limit pops up a lot in engineering, not just on paper but in actual physical or electrical functions.
That said, in electronics we use graph paper as writing paper so doing a graph with 3 samples is quicker.

[phild]

This brings me back 50 years. Thanks.
I recently talked with one of the guys who was also in that class.

[its_elkku]

I love this bite sized math content, feels like I'm getting a bit smarter every day :D

[frostshock]

I haven't taken calculus in my life and was interested. Only to be completely distracted by the lifetime supply of expo markers.

[Lolwutdesu]

Are we not gonna talk about the amount of markers he's got stored in the background? I've seen entire schools have less than that lmao

[cmyk]

Finally! A problem on this channel I could solve on my own!

[_Just_Another_Guy]

Btw, the graph shows that the two lines doesn't meet at a certain point (diverging on an asymptote) so that's what DNE literally means: there's no convergence at any particular point.

[HenrikMyrhaug]

Mathematicians:
0.999...=1
Also mathematicians:
0+ is not the same as 0

[lengeschder]

I wish I had this channel when I was in calculus years ago. Thank you for a clear-cut explanation and getting me interested in math again.

[ravenousstrike]

I just literally advance self-studying Calculus 1 rn and this is my 1st video yt recommend it. I didn't know that we can also have exponential signs to determine if + or - infinity but i alr knew that it will be DNE bcuz of + & - infinity are not equal. Perfect timing! I can't wait for my next sem. You got a sub❤!

[tombratcher]

BRP: "You can't just say this is undefined". It's undefined.