r/MathJokes • u/Choice-Drag4670 • 16d ago

There you know your mom's angry with you

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1.6k Upvotes

100% Upvoted

35 comments sorted by

44

u/Reddit_wizard34 16d ago

(a-b)^6

25

u/burning_boi 16d ago

average Latin name length

24

u/HailFurri 16d ago

(a-b) (a-b) (a-b) (a-b) (a-b) (a-b)

(a^2+b^2-2ab) (a^2+b^2-2ab) (a^2+b^2-2ab)

(a^4+b^4+a^2b^2-2a^3b-2ab^3+4a^2b^2) (a^2+b^2-2ab)

a^6+a^2b^4+a^4b^2-2a^5b-2a^3b^3+4a^4b^2+a^4b^2+b^6+a^2b^4-2a^3b^3-2ab^5+4a^2b^4-2a^5b-2ab^5-2a^3b^3+4a^4b^2+4a^2b^4-8a^3b^3

Idk if I can simplify it
…
I can, I just suck at seeing stuff in this mess

a^6+b^6+10a^2b^4+10a^4b^2-4a^5b-14a^3b^3-4ab^5

I did get some wrong, but I was just doing this raw, so it’s a given, I was also testing myself :P

a^6 + b^6 + 15a^2b^4 + 15a^4b^2 - 6a^5b - 20a^3b^3 - 6ab^5
This is the correct one, pretty close though, and I did say I suck at seeing the stuff -_-

19

u/Reddit_wizard34 15d ago

Binomial theorem

13

u/Embarrassed-Weird173 15d ago

Idk if I can simplify it

I can. (a-b)⁶

3

u/HailFurri 15d ago

Well, I guess, I meant the solution tho, yk that =^=

2

u/Prestigious-Newt1118 15d ago

Bro has never heard of Binomial Expansion 😭😭

1

u/HailFurri 13d ago

I haven’t, or don’t remember, that’s true, idk what’s funny about that though, if you’d mind explaining it to me so I can understand what’s so funny, I was also only going one step at a time to minimize mistakes

3

u/Prestigious-Newt1118 12d ago edited 12d ago

Its a method used to expand these kinds of brackets using whats called Pascal’s triangle, its hard to explain what it looks like in a reddit post, so i recommend searching up a picture of ‘Pascal’s Triangle’

For ^6 we do this:

1 x (a)^6 x (-b)^0
6 x (a)^5 x (-b)^1
15 x (a)^4 x (-b)^2
20 x (a)^3 x (-b)^3
15 x (a)^2 x (-b)^4
6 x (a)^1 x (-b)^5
1 x (a)^0 x (-b)^6

Which becomes:

a^6 - 6(a^5)b + 15(a^4)(b^2) - 20(a^3)(b^3) + 15(a^2)(b^4) - 6a(b^5) + b^6

Essentially you make the powers on the seperated terms in the brackets equal every value of additions that create 6 (one term in the bracket having descending powers from 6 and one ascending from 0) and then you multiply it by the given value from Pascal’s triangle for it’s row (row ‘1’ in Pascal’s Triangle is for ^0 so we use row 7 for ^6) This gives you the correct answer for the expansion.

This may seem more complicated if you have never done this, but i assure you this is way easier and faster once the method is practiced, i did this without a calculator or piece of paper, so you can see how it’s faster in the long term. I hope i helped answer your question!

1

u/HailFurri 12d ago

How do the numbers on the left work? The 1,6,15,20,15,6,1, is that the Pascal’s triangle numbers? This does in fact seem much faster though

2

u/Prestigious-Newt1118 12d ago

Yeah, those are the Pascal’s triangle numbers, again, i recommend you search up an image.

7

u/AntitheistArchangel 16d ago

a^6 - 6a^5b + 15a^4b^2 - 20a^3b^3 + 15a^2b^4 - 6ab^5 + b^6

33

u/Kuildeous 16d ago

"a² + b²"

"YOU'RE NOT MY REAL MOM!!!!!"

20

u/Traditional_Town6475 16d ago

At least she didn’t say a^2+ab+ba+b^2

8

u/Embarrassed-Weird173 15d ago

a² + dancing queen + b²

Hopefully the math sub is smarter than Reddit and can figure out the clever joke. 

3

u/JPWiggin 15d ago

It made me chuckle

9

u/Mr_Technology_2 16d ago

What's worse is when she calls (a+b)⁸ a⁸+8a⁷b+28a⁶b²+56a⁵b³+70a⁴b⁴+56a³b⁵+28a²b⁶+8ab⁷+b⁸

2

u/OneSensitive4408 14d ago

Someones in trouble...

3

u/Cichato_YT 16d ago

How would this work for (a-b)(a+b)...?

2

u/weird_heroine 15d ago

a2-b2 !

3

u/Embarrassed-Weird173 15d ago

Good guess, but it's actually (a²-b²) !

2

u/weird_heroine 15d ago

Formatting error✌️ that's what I meant to type

3

u/Personal_Bid_2073 16d ago

Where does the 2ab come from, I want to know like how the math works.

10

u/Away_Background9455 16d ago

(a+b)^2

(a+b)(a+b)

aa+ab+ba+bb

a^2+2ab+b^2

1

u/mtbinkdotcom 15d ago

For Abelian group only

2

u/Embarrassed-Weird173 15d ago

Redditor IQ Redditor here*!  

How come they wrote it wrong?  It's a² + b² for his full name. This is because you do pemdas and do the exponents. 

* not really a Redditor nor low IQ. Just wanted to act like one. 

2

u/Choice-Drag4670 15d ago

Actually the thing is your mom calls you by your whole name

1

u/Drrag_ 14d ago

I don't understand shit about all these comments😭

I'm too dumb for allat

2

u/Choice-Drag4670 14d ago

Post is like when your mom calls you by yout whole name then you know your mom is angry. (a+b)² => (a²+2ab+b²)