The Official Homework Help Thread

[Zandy]

https://i.gyazo.com/b8e8705f2b1bb47c73225e48e305bc99.png

im helping my bff with geometry (which i passed with an a wtf) and i dont understand what the **** this is. i can only solve the last one

- - - Post Merge - - -

and we dont know what the hell the ?s mean

What level of math are these equations from?

I'm going to make a guess that the question marks are meant to be placeholders for functions so that the lefthand side equals to the righthand side. If that's the case, for ? = f(x) then the third question goes from:

x^2 + 4x + 2 = ? + 2

And reduces to:

x^2 + 4x + 2 = f(x) + 2

And then ? = f(x) = x^2 + 4x.

Of course, the first and second questions would be rather difficult to solve for. If not, I'm sorry I couldn't be of more help xD. I've never seen the ? symbol used in geometry/algebra let alone mathematics xD.

 

[radical6]

Does your friend remember anything from class about Minkowski's question mark function or maybe quadratic irrationals? A question mark in a math equation can represent this function but it seems a bit unusual for a geometry class.

nope all shes taken is alg 1 and her whole school failed alg 2 so i dont really think she learned anything from alg 2

 

[wassop]

no theyre seperate equations i believe. its very basic geometry too so idk why her teacher would give her calc stuff. she just started geometry too yesterday so like

i think its a printing error? theres like question marks on other problems too so im not sure what the hell happened

yeah that's really strange , i don't remember my geometry problems ever looking like that - especially at the beginning . it might just be an error on the other end , i hope she finds an answer soon !

 

[Sona]

bump!

 

[Sona]

bump!

 

[Sona]

bump!

 

[Monster]

Here's a quick calculus question.



I understand the whole divide by the highest degree in the denominator, but I am not getting the right answer. I am getting 2 and apparently I am having a sign issue.

 

[Zandy]

Here's a quick calculus question.

View attachment 145504

I understand the whole divide by the highest degree in the denominator, but I am not getting the right answer. I am getting 2 and apparently I am having a sign issue.

I think I might know the problem. You want to factor the x^2 out of the radical and when you do you will get a term including sqrt(x^2) = |x|! Since x approaches negative infinity, we have that x < 0 and so |x| = -x. You should be able to get the right solution after that. Here's the full solution since you've already attempted it ^^.

 

[Monster]

I think I might know the problem. You want to factor the x^2 out of the radical and when you do you will get a term including sqrt(x^2) = |x|! Since x approaches negative infinity, we have that x < 0 and so |x| = -x. You should be able to get the right solution after that. Here's the full solution since you've already attempted it ^^.

Thanks for the help. Actually, the answer to this limit is -1. Also, the last 2 steps, you factored out an x I believe, but I couldn't find where the x went.

What program are you using to write the steps? I would love to show you how I attempt to do it and would love an explanation as to why I am getting the wrong answer, thanks!

 

[Zandy]

Thanks for the help. Actually, the answer to this limit is -1. Also, the last 2 steps, you factored out an x I believe, but I couldn't find where the x went.

Oops, you're right! Sorry for the mistake xD (It's 12:40AM here). Were you able to arrive at the correct answer then ^^?

 

[Monster]

Oops, you're right! Sorry for the mistake xD (It's 12:40AM here). Were you able to arrive at the correct answer then ^^?

It's completely fine. I appreciate your homework help. Anyways, I'd love to show you my work, but I don't know what program you use, but basically here's what I did (and it's not correct).


First, I took advantage of the difference of squares and manipulated the numerator.

I get: ( x^2 - (x^2 + 2x))/(x - rad(x^2 + 2x))

I simply to get: -2x/(x - rad(x^2 + 2x))

After that I divide each term by the highest degree in the denominator (so it would be x^1).

I then get ( -2x/x)/(x/x - rad (x^2/x^2 + 2x/x^2))

I then take the limit as it approaches negative infinity and get -1/(1 - rad(1 + 0)) to get the answer of infinity.

However, this is the wrong approach and the answer is supposed to be -1.

 

[Zandy]

It's completely fine. I appreciate your homework help. Anyways, I'd love to show you my work, but I don't know what program you use, but basically here's what I did (and it's not correct).


First, I took advantage of the difference of squares and manipulated the numerator.

I get: ( x^2 - (x^2 + 2x))/(x - rad(x^2 + 2x))

I simply to get: -2x/(x - rad(x^2 + 2x))

After that I divide each term by the highest degree in the denominator (so it would be x^1).

I then get ( -2x/x)/(x/x - rad (x^2/x^2 + 2x/x^2))

I then take the limit as it approaches negative infinity and get -1/(1 - rad(1 + 0)) to get the answer of infinity.

However, this is the wrong approach and the answer is supposed to be -1.

I must apologize - the original attempt I had made had more errors in it that I had realized xD. In my original attempt at the question, I divided by 1/x which isn't allowed unless I multiply the entire equation by x (which would lead nowhere in this problem).

I looked through your attempt and your method allows you to divide through by the highest power. You just made a tiny mistake by dividing the interior of the radical by x twice. Here is the correct solution I believe (double check my work because I'm kind of tired still xD):

By the way, I use Latex to format the equations and I just screenshot them and upload them !

 

[Monster]

I must apologize - the original attempt I had made had more errors in it that I had realized xD. In my original attempt at the question, I divided by 1/x which isn't allowed unless I multiply the entire equation by x (which would lead nowhere in this problem).

I looked through your attempt and your method allows you to divide through by the highest power. You just made a tiny mistake by dividing the interior of the radical by x twice. Here is the correct solution I believe (double check my work because I'm kind of tired still xD):

By the way, I use Latex to format the equations and I just screenshot them and upload them !

Thanks a lot! I can't believe I overlooked this. Wow, I am going to go here frequently, you don't have to answer this if you don't want to but are you in college or have you graduated or perhaps you might still be in HS? Also, could you help in AP Physics C once I get to the point where I need help?

 

[Zandy]

Thanks a lot! I can't believe I overlooked this. Wow, I am going to go here frequently, you don't have to answer this if you don't want to but are you in college or have you graduated or perhaps you might still be in HS? Also, could you help in AP Physics C once I get to the point where I need help?

No problem! Sorry for the mistakes in my original response though xD. I haven't really looked at calculus in the past 4 months so I'm a little rusty. But I don't mind answering that question! I am in my third year of university , but unfortunately, I don't know a lot when it comes to physics so I wouldn't be able to help you there, but feel free to pose the question and hopefully there's someone else in the forums who can help !

 

[Monster]

No problem! Sorry for the mistakes in my original response though xD. I haven't really looked at calculus in the past 4 months so I'm a little rusty. But I don't mind answering that question! I am in my third year of university , but unfortunately, I don't know a lot when it comes to physics so I wouldn't be able to help you there, but feel free to pose the question and hopefully there's someone else in the forums who can help !

I wish you plenty of rest. I will make sure to return to this thread when I am in a conundrum. Thanks~!

 

[Sona]

bump

 

[tokkio]

any biology majors who know/have links to good references online about animal cell structures and/or cells in general? huhuh im dyingngngn

 

[Sona]

any biology majors who know/have links to good references online about animal cell structures and/or cells in general? huhuh im dyingngngn

bump for your question ; v ; !

 

[Sona]

 

[Zandy]

any biology majors who know/have links to good references online about animal cell structures and/or cells in general? huhuh im dyingngngn

Bump ^^.

Hopefully you can get an answer to your question soon!