Sqrt(9)

Comment on teachings

Gemini24601@lemmy.world 3 months ago

Doesn’t x also -3?

## dankestnug420@lemmy.ml 3 months ago

## UnRelatedBurner@sh.itjust.works 3 months ago

Uhm, actually 🤓☝️!

Afaik sqrt only

*returns*positive numbers, but if you’re searching for X you should do more logic, as both -3 and 3 squared is 9, but sqrt(9) is just 3.If I’m wrong please correct me, caz I don’t really know how to properly write this down in a proof, so I might be wrong here. :p

(ps: I fact checked with wolfram, but I still donno how to split the equation formally)## criitz@reddthat.com 3 months ago

You’re correct. The square root operator only returns the principal root (basically, the positive one).

So if x ^2^ = 9 then x = ±√9 = ±3

## UnRelatedBurner@sh.itjust.works 3 months ago

Thanks, I haven’t connected the dots to that (±) sign and this problem.

## Routhinator@startrek.website 3 months ago

## h3ndrik@feddit.de 3 months ago

|x| = sqrt(…)

would be correct.

## UnRelatedBurner@sh.itjust.works 3 months ago

Cool! Makes sense to me. Honestly, I’ve never done it this way, but it’s so clean. Love it. Thanks.

## Evil_Shrubbery@lemm.ee 3 months ago

Fund the sqrter!

## Kusimulkku@lemm.ee 3 months ago

Sqrt

hehe

## lugal@lemmy.ml 3 months ago

You found the other

## uis@lemm.ee 3 months ago

Now kiss

## Pringles@lemm.ee 3 months ago

🎶 I was made for solving you baby 🎶