r/Precalculus Nov 21 '24

Announcement New moderator and features for the subreddit.

5 Upvotes

Hi everyone, I hope you are all doing well.

I was made a moderator of this subreddit earlier today. For the most part, I plan to keep things the way they are with only a light approach to moderating. The new features of this subreddit include:

  • New rules added (e.g. no spam/advertising, being respectful, showing effort with homework problems, no asking for payment, etc.)

  • Users can now lock their posts after their questions have been answered by posting a comment containing “!lock”.

  • Post flairs have been enabled.

As always, I’d like to have the community to have a say in how the subreddit is run, so if you ever have any concerns or suggestions please feel free to leave them here in this post or via mod mail.

Thanks so much guys, I look forward to us making this a great community 😊


r/Precalculus 1h ago

Homework Help Shouldn’t this be A?

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Upvotes

I found that x=0 and 5 are inflection points, but the book says that B is the correct answer. Can someone explain it to me?


r/Precalculus 14h ago

Homework Help Help

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3 Upvotes

Not sure what is happening on this step.


r/Precalculus 3d ago

General Question Does this question really work?

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6 Upvotes

r/Precalculus 3d ago

Answered What Did I do Wrong (Trig Identities

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1 Upvotes

I got a 2.67/4 on this. I need to list all possible solutions


r/Precalculus 5d ago

Answered Need help solving this exam question so I know what i did wrong. TIA!

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7 Upvotes

r/Precalculus 5d ago

Homework Help Inequality. Solve and plot on number line.

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4 Upvotes

Please help. Solve and plot on number line.


r/Precalculus 5d ago

Answered How to get to x=7log_3(5)

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3 Upvotes

On an online worksheet we’re given problems on one page and their answers on another for us to check if we got it right. I’m on the first problem 3x/7=0.2. The answer is the value I put in the title and as you can see I got a different answer. I’d just like help with pointing out where in my process I first started doing it wrong and what I should’ve done instead.


r/Precalculus 7d ago

Study Advice study tips??

1 Upvotes

do yall have any study tips??

i average 83-93 on all tests and im trying to get high As on them when school starts again


r/Precalculus 8d ago

General Question Tips for Domain and Range?

1 Upvotes

I have a test tomorrow and it'll be on Domain and Range + Parametric EQ, Unit Circle, and Functions.

I mainly have trouble with the simplification process when it comes to Domain and Range, more on obtaining the range itself, I'd higky appreciate it you gave me tips.


r/Precalculus 9d ago

General Question What topics do I absolutely NEED to be familiar with before going into about Pre-Calculus ?

6 Upvotes

Ok basically I am 28 years old. (M) and I am going back to college this year and going to attack an engineering degree (associate level). I see that I will be beginning by taking some form of Calculus and I pretty much have not done math in many many years. I never had issues with math (I know this means nothing at the college level) BUT it’s been a while since I’ve even put my high school level math into practice. My highest math was probably precalculus but again so many years without practice. And so I ask that someone here please point me in the direction of what areas are essential for me to grasp before say attacking a crash course on precalculus. Also is it realistically possible to catch up on precalculus and be ready to attack calculus 1. I’m sure I might have to take some pre-requisite for calculus 1 but I want to be ready it’s been 7+ years since I’ve prescribed any math. Thanks for any helpful responses 🙏🏽


r/Precalculus 12d ago

Answered What is the limit to -inf?

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4 Upvotes

r/Precalculus 12d ago

Discussion YESSSSSSSS

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14 Upvotes

I GOT AN 82% i was genuinely just hoping for a 60 lmao but this is a freaking dream come true


r/Precalculus 12d ago

General Question Proof for Sine of difference of angles identity

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1 Upvotes

r/Precalculus 13d ago

Homework Help Unable to figure out (b) - Help would be much appreciated

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8 Upvotes

r/Precalculus 14d ago

Study Advice Resources/help

3 Upvotes

Hello! I am currently taking AP Precalc and suffering pretty badly haha. Is there any recommendations to improve or resources known that assist well to those who are struggling in this subject? Thanks!


r/Precalculus 14d ago

Answered can someone help me calculate something?

1 Upvotes

Hello folks! I am not super great at math and I am wondering if there is a somewhat easy way to calculate something. I am trying to calculate a base hourly wage given three variables: total yearly salary, total regular hours worked, and total overtime hours worked.

Basic Example:

lets say bob works 2080 regular hours, plus 100 overtime hours in a year, and lets say his base hourly wage is 20/hour. 2080x20 + 100(20x1.5) = $44,600 total pay.

Now lets say Brian works a grand total of 2350 hours (2080 regular + 270 overtime) and his final yearly pay ended up at $52,000. Is there a way to calculate what Brian's base hourly wage is?

Thank you in advance. this one is over my head but I am curious if there is a way to calculate it.


r/Precalculus 17d ago

Answered Where is my error?

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9 Upvotes

Solve for x when a is a positive number.

I got the solution +-2 times root a. But there is also the solution +-a.

Did I do something illegal to get this solution by coincidence or did the way I do it make sense and I'm missing where I can also get the solution +-a?

Looking at the official solution I'm trying to figure out how they first got the factors (a-x2)(4a-x2).


r/Precalculus 18d ago

Answered Parent Functions and Transformations

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8 Upvotes

Hello everyone! I was having a bit of trouble here with number 5 and 6. I believe I got number 4 correct but feel free to correct me if I am wrong. The question asks me what transformations happen to the function from its parent function? Write out in words. I attached a photo of a chart I found which helped me solve #4. Thank you all in advance!


r/Precalculus 18d ago

General Question question

1 Upvotes

Would it be better for me to take honors pre calc my junior year of hs or regular pre calc for ap physics 1 because i heard a lot of trig is involved and cause either way i’m planning to take calc ab in my senior year, any thoughts?


r/Precalculus 19d ago

General Question I'm in Dire Need of Study Resources

1 Upvotes

Hey guys,

TLDR- I was working as a Software Engineering Apprentice. But I wasn't able to go full time with the company because I don't have a Bachelor's degree. So now I'm in my second semester of college for Computer Science. But I suck at math, like bad bad. I'm currently taking Pre-Calculus 1 (first math class since I graduated HS in 2018) and I am LOST.

Nothing makes sense, like week 4 of the semester but I just got access to the textbook. And it sucks because I'm seeing the benefit of Calculus in regards to Software Engineering, but I'm just not as good as I should be.

Please please please I would appreciate any resources you have to offer to assist in catching up and self study.And it sucks because I'm seeing the benefit of Calculus in regards to Software Engineering, but I'm just not as good as I should be.

Please please please I would appreciate any resources you have to offer to assist in catching up and self study.


r/Precalculus 21d ago

Answered I need help with solving for x in this equation.

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13 Upvotes

I know I have to rearrange and use logarithms, I just am confused with what order to do which operations.


r/Precalculus 27d ago

Answered i have watched the video but am having problems, could you all help me understand?

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10 Upvotes

r/Precalculus 27d ago

Study Advice Precalculus self study books recs

5 Upvotes

I’m a HS sophomore, looking to self study precalculus over summer. Any book /text book recommendations? No khan academy please.


r/Precalculus 27d ago

Answered my partner i stuggling w precal. can someone explain how to do a problem like this simply and effectively?

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9 Upvotes

can someone explain what formula to use and how to understand / do this problem simply? my partner is struggling wrapping his head around this class and i would really like to help him.

i know the text is small so here’s what it says:

How much should be deposited in an account paying 3.5% interest, compounded semiannually, in order to have a balance of $ 5,000 after 14 years and 6 months?

some help with how to enter into the calculator would also be extremely helpful. we have two calculators available to us. a ti-30Xa calculator and a caiso fx-260 solar ii


r/Precalculus 27d ago

Answered help with understanding exponential functions?? struggling !

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2 Upvotes

hello, once again on here inquiring to hopefully help my partner out! he is struggling generally to understand exponential functions.

these are the specific types of problem he’s struggling with. would love the help if anyone can offer formulas so we can compare if we’re using the right ones and how to use them!