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[-] pr06lefs@lemmy.ml 185 points 10 months ago* (last edited 10 months ago)

What about plain old x = -10?

-10 ^ 2 = 100
-10 ^ 3 = -1000
-10 ^ 5 = -100000

[-] Redacted@lemmy.world 122 points 10 months ago

Isn't that the joke?

[-] Enkers@sh.itjust.works 68 points 10 months ago

That's what he wrote, I imagine.

[-] Siethron@lemmy.world 39 points 10 months ago

It is, but with imaginary numbets

[-] JackbyDev@programming.dev 47 points 10 months ago

i² = -1 so...

[-] dwindling7373@feddit.it 32 points 10 months ago
[-] Abracadaniel@hexbear.net 13 points 10 months ago

of course, but this problem is solvable without any understanding of complex numbers, and 10*i^2 is a really clunky, multi-operation expression whereas -10 is just an integer.

simplifying one's answers is standard practice and any grader who received the answer in the OP would be obligated to point out that while technically correct, they're missing the basic fact that the answer is -10.

The Rube Goldberg comment is apt as the solution is absurdly complicated and overengineered for the task it performs.

[-] dwindling7373@feddit.it 2 points 10 months ago

Yes that's what the thing you are looking at is built upon.

[-] thedudeabides@lemmy.dbzer0.com 20 points 10 months ago
[-] pr06lefs@lemmy.ml 40 points 10 months ago

people being pedantic showoffs doesn't really register as humor for me, TBH

[-] thedudeabides@lemmy.dbzer0.com 14 points 10 months ago

That's true, the OOP is being quite snarky with their comment on a post where someone's had a genuine basic doubt

[-] aaaaaaadjsf@hexbear.net 12 points 10 months ago

Yeah exactly you're right, why overcomplicate the problem like the Reddit comment did? I guess that's just typical Reddit thinking that being pendantic and using lots of fancy words and long explanations makes you smart.

[-] Krauerking@lemy.lol 3 points 10 months ago

Nah just boiler plate autism.

[-] Deconceptualist@lemm.ee 10 points 10 months ago

That was my immediate thought too.

[-] Sphks@lemmy.dbzer0.com 5 points 10 months ago
[-] Deebster@programming.dev 102 points 10 months ago

When all you have is an imaginary hammer, everything looks like a rotation around the imaginary unit circle.

Explanation of mathsx = -10, i = √-1 so i² = -1 and 10i²=-10

[-] MonkderVierte@lemmy.ml 15 points 10 months ago

Found the math but no explanation.

[-] JackbyDev@programming.dev 15 points 10 months ago

The squareroot of 100 is ±10.

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[-] fx3@beehaw.org 4 points 10 months ago

IIRC, your spoilery “so” is the other way round. The right side is the definition, and the left-hand side a layman’s shorthand, as the root operator isn’t defined on negative numbers.

I might very well be wrong. My being a mathematician has been over for a while now, my being a pedantic PITA not though.

[-] Deebster@programming.dev 5 points 10 months ago

I don't know enough to know how correct your pedantry is (technically or not), but to explain the meme it made sense to go through the symbols in the order you see them. I never got any points from the proof questions in exams anyway.

[-] NigelFrobisher@aussie.zone 37 points 10 months ago

Wait, isn’t x just -10 if x^3 is not 1000?

[-] bi_tux@lemmy.world 15 points 10 months ago
[-] iAvicenna@lemmy.world 27 points 10 months ago

that is a very long way to write -10

[-] southsamurai@sh.itjust.works 13 points 10 months ago
[-] Cryophilia@lemmy.world 45 points 10 months ago

That's because the explanation was about 10 times as complicated as it needs to be

[-] mexicancartel@lemmy.dbzer0.com 23 points 10 months ago

He is trolling with overcomplicating

[-] Yaysuz@lemm.ee 10 points 10 months ago

What an extremely unnecessary explanation. As a math teacher I would have deducted points for this answer.

[-] androogee@midwest.social 8 points 10 months ago

"show your work"

Malicious compliance intensifies

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[-] Ravi@feddit.org 9 points 10 months ago

No definition what values are suitable for x.

[-] quicksand@lemm.ee 21 points 10 months ago

x has to be -10, right? Or am I missing something?

[-] jacksilver@lemmy.world 7 points 10 months ago

Yeah, I think the point is that the person answering was wrong/over complicating. If x=10i, then x^2 would be -100 (or potentially -10 depending on what you think the ^2 is applied to).

[-] Khanzarate@lemmy.world 23 points 10 months ago

They said x=10i^2, not 10i. Difference is it equals -10, and they chose not to simplify.

[-] SoleInvictus@lemmy.blahaj.zone 5 points 10 months ago

They're correct, it's just overcomplicated as fuck in ways that are correct but completely irrelevant to the question.

[-] Ravi@feddit.org 4 points 10 months ago

Depends on what are the allowed values for x are. Real numbers, complexe numbers, binary or I made up my own numbers ;)

[-] WolfLink@sh.itjust.works 4 points 10 months ago

The answer in the meme (10i^2) is -10

[-] Malgas@beehaw.org 3 points 10 months ago

Probably what they were going for, but there are literally an infinite number of exotic arithmetic spaces you could ask this question in. For example, x=10 works in any ring with a modulus greater than 100 and less than 1000.

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[-] Xavienth@lemmygrad.ml 7 points 10 months ago* (last edited 10 months ago)

Therefore i¹⁰ = ln(-1)¹⁰/pi¹⁰ = -1

This is true but does not follow from the preceding steps, specifically finding it to be equal to -1. You can obviously find it from i²=-1 but they didn't show that. I think they tried to equivocate this expression with the answer for e^iπ^ which you can't do, it doesn't follow because e^iπ^ and i¹⁰ = ln(-1)¹⁰/pi¹⁰ are different expressions and without external proof, could have different values.

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this post was submitted on 24 Jul 2024
373 points (96.7% liked)

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