Schoolwork Help Thread

[Olimar12345]

At 920 words, I'm almost a third there. Though, I am prepared to pull an all-nighter if I have to. Anything it takes to get this piece of shit done by 11 AM lmao

Edit: Update: slowing down... I'm at 1224 words now...

[Sebastian]

would u like a trophy

No, I'm just making a statement. Don't give me a smart remark every time I say something.
Thank you.

Btw, good luck with your paper, Olimar!

[Olimar12345]

Thanks, but her "smart remark" was just about as useful as your comment was. It kind of came out of nowhere and did not lend itself to the conversation whatsoever. Work on that, lol.

[Olimar12345]

UGH 20...MORE...WORDS....

[braix]

GOGOGO
TAKE OUT EVERY CONTRACTION
GG
BULLSHIT WINS

[Olimar12345]

Lol I got a B on it xD procrastination wins!

[braix]

GG
BULLSHIT WINS

[Bubbles]

Can someone please help me with this -_-" I feel like it's really easy but my brain refuses to work

If y=f(x) is a solution to dy/dx = 1/(xy) with f(1)=2, find (d^2y)/(dx^2) at the point (1,2)

All I have to do is take the derivative of 1/(xy) right? So would that be -(x+y)/(xy)^2? Or do I still evaluate with dy/dx and get something like [x(dy/dx) + y]/-(xy)^2? Or is there a whole other way I'm not doing it

[Latios212]

I'll be back in a bit to either do it or check whoever did it

[Bubbles]

thank you T-T

[Zeila]

You do implicit differentiation (there's another way to do it with partial derivatives, but this is simple enough) to get -[x(dy/dx) + y]/(xy)^2 (which is what you had previously), then plug in dy/dx = 1/(xy) to get -[1/y + y]/(xy)^2, and finally plug (1, 2) into the equation. You were pretty close, but you just needed to plug in what was already given to you

I might be wrong though, so if this is a question in a book that has answers in the back, then just say if you ended up getting the right answer or not and then Latios (or someone else) can help you with it

[Bubbles]

That looks vaguely familiar I think it's right ahh

Thank you so muchh we normally get the answers for these things so I could work backwards if I don't get it but not for this one :/

[Latios212]

[x(dy/dx) + y]/-(xy)^2?

-[x(dy/dx) + y]/(xy)^2
-[1/y + y]/(xy)^2, and finally plug (1, 2) into the equation

Mhmm looks right to me. You're taking the derivative of 1/xy with respect to x and end up with that. But since x=1, y=2 at this point and you have a form of dy/dx in terms of x and y, you can evaluate and get a number. Like -5/8, I think.

please tell me if I'm wrong when you get the answers because I haven't done calculus in quite a while

[mikey]

I miss math class

[Bubbles]

Yup I got -5/8 as a final answer ^^ thanks you guys

I miss math class

Math class was decent until this year :/ my teacher believes in the student figuring out the majority of the work so you learn it better, but that's turned into her not explaining things thoroughly. It's not a good sign when in the beginning of the year you're told "don't expect to get near an A in this class, you're not supposed to"