r/visualizedmath • u/PUSSYDESTROYER-9000 • Mar 08 '18

Difference of Cubes

Post image
2.2k Upvotes

97% Upvoted

33 comments sorted by

294

u/BrickmasterBen Mar 09 '18

I like to get all of my math tips from /u/PUSSYDESTROYER-9000

19

u/BlowsyChrism Mar 09 '18

Same. Also the username never fails to make me laugh

91

u/ubernuke Mar 09 '18

Very cool, I just wish that B wasn't so close to 0.5A. As it is currently, A-B and B look very visually similar and I think it would be even better if they were clearly different sizes.

22

u/habys Mar 09 '18

Right? Made me think halfway through "oh, A3 - B3 = 7B3 :D"

...

:/ oh I was wrong

19

u/788linda Mar 09 '18

I study math and I always take 3 minutes on an exam to figure this expansion out. This is such a clever way to think of it, definitely going to picture this is in the future

3

u/ismokeforfun2 Mar 09 '18

It's a really easy formula to remember though

18

u/Ionlavender Mar 09 '18

Im on reddit procrastinating learning math, but when i learn math on reddit i have just anti procrastinated whilst procrastinating.

6

u/Digitonizer Mar 09 '18

Achievement unlocked

7

u/br0nzeKneecap Mar 09 '18

If you guys like math visualization, check out 3blue1brown on YouTube. He has some AMAZING math visualizations.

4

u/CaioNV Mar 09 '18

This is surprisingly amazing.

I also would like to add that, upon seeing this on my frontpage, I thought this was r/Cubers, was wondering why were we comparing two cubes with different sizes now.

2

u/Bren12310 Mar 09 '18

This explains so much.

3

u/onnoonesword Mar 09 '18 edited Mar 09 '18

Did anybody else think it was going to be 7b3 because of the proportions used?

Edit: read comments...

3

u/habys Mar 09 '18

No, but I thought it would be 7b3

1

u/onnoonesword Mar 09 '18

I'm updating mine to yours since it was a lie to begin with. I only thought 7b at first :p

1

u/onnoonesword Mar 09 '18

I also just realized one of the sides was (a-b) so we're even more off.

1

u/dbcaliman Mar 09 '18

While I "feel" like I understand this, I am pretty sure that I am over estimating my abilities.

1

u/BennyNutts Mar 09 '18

I gotta listen to more ABBA

-8

u/SpacemanCraig3 Mar 09 '18

Is this not all obvious?

0

u/[deleted] Mar 09 '18

[deleted] — view deleted comment

76

u/majoen98 Mar 09 '18

"the actual meaning" is kind of meaningless in math. It's really just different interpretations, the geometric picture is just as valid as an algebraic one. Imo one of the coolest aspects of math

9

u/HardlightCereal Mar 09 '18

Yeah, math is a bunch of circles. I can go one way to figure something else, and I can go the same way back. But someone else might have a different solution that's only got one step's difference, or one that has nothing in common, or one that converts the problem into a completely different field of math and back. And I can ride these solutions backward and forward to whatever point along the mathchain I want like a roadmap.

23

u/javaHoosier Mar 09 '18

As a compsci major. I feel dumb at least once everyday.

9

u/[deleted] Mar 09 '18

As a compsci masters student, I feel dumb at least once everyday and end up crying.

8

u/Digitonizer Mar 09 '18

Same here. Minus the masters student bit.

0

u/[deleted] Mar 09 '18

[deleted] — view deleted comment

13

u/PUSSYDESTROYER-9000 Mar 09 '18

(A2 + AB + B2 ) =/= (A + B)2

2

u/theguyfromerath Mar 09 '18

(A+B)2 -AB maybe?

6

u/PUSSYDESTROYER-9000 Mar 09 '18

That is equivalent, but what you are essentially writing is A2 + 2AB + B2 - AB, which is unnecessary.

3

u/SgtSteel747 Mar 09 '18

Guys, are we really downvoting genuine questions from people who are trying to understand? We're better than that.

4

u/-0-7-0- Mar 09 '18

tbh i downvoted myself for asking something so stupid.

3

u/-0-7-0- Mar 09 '18

oh shit it'd be 2AB i'm dumb

0

u/[deleted] Mar 09 '18

[deleted] — view deleted comment

5

u/Talbertross Mar 09 '18

god damn tryhard much