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WTF ๐คฆ
(sh.itjust.works)
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this post was submitted on 22 Jan 2024
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Math Memes
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There isn't a valid answer to the question.
Ignore the numbers, and just think about this:
Is there a number that you can add 2 to, that would equal the same about as if you subtracted 2 from it?
The answer is no.
So the person, who is pretending to be smart, just did a bunch of fake math.
Also โ4 = 2, so the "answer" they have is just them trying to re-write the question x + 2 = x - 2.
โ4=+-2
The square root of x is usually defined as the positive real number that squares to x, so x^2 = 4 => x = +-2 but sqrt(4) = 2, not +-2
The complex sqrt function is multivalued, but that opens a whole other can of worms
And even if you allowed sqrt(4) = ยฑ2, it would still be invalid to evaluate it to -2 on one side of the equation, but then use +2 on the other side.
Of course, you can only choose one at a time, not mix and match, lol ๐.
Oh yeah, you're right, now I remembered ๐คฆ. Been a while ๐, almost 20 years.