I refuse to help with a problem as trivial as that. They should be perfectly capable of finding on their own any one of the 4 a:s in the picture they posted.
It does, he just didn’t show that a/√a simplifies to √a. There are a couple ways to think about it, but the simplest is if you just wanna get rid of the square root in the denominator, you can multiply the entire left side by (√a/√a) which gives you a√a / √a√a.
This then turns into a√a/a. From there you get to just √a
This is absurd. It says find "a" but which "a"? There are more than one. In American "math" there can only be one "a". In British "maths" it looks like there can be more than one "a", so it depends on where you are from.
I was going to ask if anyone knew why each version developed preference in the area it's used, but figured I'd just search myself. I swear, no link I found tells why, even the ones that claim they'll tell why. It's just something that occurred over time. There has to be a better reason.
Little known math fact: Greek letters are in fact not real letters. They're just random squiggles mathematicians come up with as notation because some asshole has already used up the other squiggles.
23 Comments
RiceMunk@sopuli.xyz · 24 pts · 238d
I refuse to help with a problem as trivial as that. They should be perfectly capable of finding on their own any one of the 4 a:s in the picture they posted.
Jake_Farm@sopuli.xyz · 21 pts · 238d
The second guy fucked up on the second step.
IndolentRoshi@lemmy.world · 3 pts · 237d
No he didn't
ignotum@lemmy.world · 10 pts · 237d
They did, in a sense, they skip a few steps and just jumps to the answer
a_non_monotonic_function@lemmy.world · 8 pts · 237d
One of my most important lessons to my students is that they are idiots. I am an idiot. Everyone else is an idiot.
Idiots make mistakes.
When we skip steps we make mistakes.
PhobosAnomaly@feddit.uk · 18 pts · 238d
Alright, education time needed!
I'm a fair few years out from my entry level uni maths module, so:
In between the second and third step of the solution, why is 1a / 2√a = 6
not evaluating as
a/√a = 12 ?
sacredfire@programming.dev · 50 pts · 238d
It does, he just didn’t show that a/√a simplifies to √a. There are a couple ways to think about it, but the simplest is if you just wanna get rid of the square root in the denominator, you can multiply the entire left side by (√a/√a) which gives you a√a / √a√a. This then turns into a√a/a. From there you get to just √a
PhobosAnomaly@feddit.uk · 24 pts · 238d
Fucking hell, thank you. I thought I was going quite mad - I'd just taken a detour in solving it instead.
Cheers friend!
eta@feddit.org · 14 pts · 238d
a = (√a)^2 = √a √a
Then you have (√a √a) /(2 √a) = 6 and can cross out one √a and multiply by 2 to get √a = 12
rImITywR@lemmy.world · 3 pts · 238d
Multiply the left side by 1=√a/√a
SnokenKeekaGuard@lemmy.dbzer0.com · 11 pts · 238d
Would fail at hide and seek - https://lemmy.dbzer0.com/pictrs/image/756624c5-b684-4d31-8278-982d22f6bcb9.webp
30p87@feddit.org · 9 pts · 238d
3a / 6a√a = Ia / 2a√a
Fucking Ia?
Avicenna@programming.dev · 4 pts · 237d
1a
Furbag@lemmy.world · 4 pts · 237d
I'm literally too stupid to understand math memes.
melsaskca@lemmy.ca · -2 pts · 238d
This is absurd. It says find "a" but which "a"? There are more than one. In American "math" there can only be one "a". In British "maths" it looks like there can be more than one "a", so it depends on where you are from.
LePoisson@lemmy.world · 15 pts · 238d
What? "a" should all be the same value idk what teachers you had but math doesn't change based on your location.
melsaskca@lemmy.ca · 4 pts · 237d
I was being an idiot and didn't put a "/s" behind. A bad joke about calling it "math" in North America and "maths" in the UK.
LePoisson@lemmy.world · 4 pts · 237d
I was just very confused!
melsaskca@lemmy.ca · 2 pts · 237d
That's my constant state! All the best.
Rhaedas@fedia.io · 2 pts · 237d
I was going to ask if anyone knew why each version developed preference in the area it's used, but figured I'd just search myself. I swear, no link I found tells why, even the ones that claim they'll tell why. It's just something that occurred over time. There has to be a better reason.
driving_crooner@lemmy.eco.br · 1 pts · 237d
French natural numbers starting with 0 be like.
Sidhean@piefed.social · 11 pts · 238d
This makes American math much more difficult, as the first mathematicians used up all 26 letters in 1970, shortly after the invention of math.
RiceMunk@sopuli.xyz · 7 pts · 238d
Little known math fact: Greek letters are in fact not real letters. They're just random squiggles mathematicians come up with as notation because some asshole has already used up the other squiggles.