- pr06lefs ( @pr06lefs@lemmy.ml ) English99•2 months ago
What about plain old
x = -10
?-10 ^ 2 = 100
-10 ^ 3 = -1000
-10 ^ 5 = -100000- JackbyDev ( @JackbyDev@programming.dev ) English27•2 months ago
i² = -1 so…
- dwindling7373 ( @dwindling7373@feddit.it ) English18•2 months ago
10 * i^2 is -10.
- thedudeabides ( @thedudeabides@lemmy.dbzer0.com ) English14•2 months ago
Nothing gets past you eh?
- pr06lefs ( @pr06lefs@lemmy.ml ) English20•2 months ago
people being pedantic showoffs doesn’t really register as humor for me, TBH
- thedudeabides ( @thedudeabides@lemmy.dbzer0.com ) English7•2 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
- Deconceptualist ( @Deconceptualist@lemm.ee ) English7•2 months ago
That was my immediate thought too.
- Sphks ( @Sphks@lemmy.dbzer0.com ) English3•2 months ago
Boooooring
- Deebster ( @Deebster@programming.dev ) English62•2 months ago
When all you have is an imaginary hammer, everything looks like a rotation around the imaginary unit circle.
Explanation of maths
x = -10, i = √-1 so i² = -1 and 10i²=-10
- MonkderVierte ( @MonkderVierte@lemmy.ml ) English7•2 months ago
Found the math but no explanation.
- JackbyDev ( @JackbyDev@programming.dev ) English11•2 months ago
The squareroot of 100 is ±10.
- OozingPositron ( @OozingPositron@feddit.cl ) English6•2 months ago
The square root is always positive, but you can plug it into the quadratic formula to get the two possible values.
- JackbyDev ( @JackbyDev@programming.dev ) English11•2 months ago
Okay, fine the square roots of 100 are ±10.
- ShrimpCurler ( @ShrimpCurler@lemmy.dbzer0.com ) English6•2 months ago
There’s no reason to bring the quadratic formula into this. Square roots can be negative, but when talking about the square root it’s normally assumed to be the principal square root, which is the positive one.
- mexicancartel ( @mexicancartel@lemmy.dbzer0.com ) English1•30 days ago
Nope. To clarify, square roots are the opposite of squaring.
Now ask yourself:
What is 10² ?
What is (-10)² ?
If you get the same answer, then they are both the roots of the answer. +10 and -10 then gets together called ±10
- fx3 ( @fx3@beehaw.org ) English4•2 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 ( @Deebster@programming.dev ) English5•2 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 ( @NigelFrobisher@aussie.zone ) English21•2 months ago
Wait, isn’t x just -10 if x^3 is not 1000?
- Yaysuz ( @Yaysuz@lemm.ee ) English11•2 months ago
What an extremely unnecessary explanation. As a math teacher I would have deducted points for this answer.
- androogee (they/she) ( @androogee@midwest.social ) English6•2 months ago
“show your work”
Malicious compliance intensifies
- Razzazzika ( @Razzazzika@lemm.ee ) English1•2 months ago
Unless I was in that clas where we had to write mathematical proofs. I HATED those. Sure, you solved the question but write out this complicated reason for why your answer is the correct answer.
- Ravi ( @Ravi@feddit.org ) English7•2 months ago
No definition what values are suitable for x.
- quicksand ( @quicksand@lemm.ee ) English15•2 months ago
x has to be -10, right? Or am I missing something?
- Malgas ( @Malgas@beehaw.org ) English3•2 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.
- Umbrias ( @Umbrias@beehaw.org ) English1•2 months ago
fortunately math problems are administered in the context of the class, so it will be pretty obvious that it’s in the complex plane.
- Ravi ( @Ravi@feddit.org ) English3•2 months ago
Depends on what are the allowed values for x are. Real numbers, complexe numbers, binary or I made up my own numbers ;)