Science Memes

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teachings (mander.xyz)

submitted 7 months ago by [email protected] to c/[email protected]

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[–] [email protected] 52 points 7 months ago* (last edited 7 months ago) (15 children)

Doesn’t x also equal -3?

[–] [email protected] 18 points 7 months ago (11 children)

Sqrt(9)

[–] [email protected] 29 points 7 months ago (8 children)

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)

[–] [email protected] 21 points 7 months ago* (last edited 7 months ago) (1 children)

x^2 = 9

<=>

|x| = sqrt(9)

would be correct. That way you get both 3 and -3 for x.

That's the way your math teacher would do it. So the correct version of the statement in the picture is: "if x^2 = 9 then abs(x) = 3"

[–] [email protected] 4 points 7 months ago

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

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