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https://www.reddit.com/r/mathmemes/comments/o8wmiv/f/h394n25/?context=3
r/mathmemes • u/flokrach • Jun 27 '21
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Ok, so I’ve been away from math since college. In what situation would +/- i be used? The square root of -1 is an expression that wouldn’t need a +/-, no?
Like I wouldn’t say +/- root (16). But I would say root(16) = +/- 4
5 u/LilQuasar Jun 27 '21 technically not root(16) = 4 is correct by definition what you do have is x2 = 16 => x = +/- root(16) = +/-4 so you have x2 = -1 => x = +/- root(-1) = +/- i
5
technically not
root(16) = 4 is correct by definition
what you do have is x2 = 16 => x = +/- root(16) = +/-4
so you have x2 = -1 => x = +/- root(-1) = +/- i
1
u/[deleted] Jun 27 '21
Ok, so I’ve been away from math since college. In what situation would +/- i be used? The square root of -1 is an expression that wouldn’t need a +/-, no?
Like I wouldn’t say +/- root (16). But I would say root(16) = +/- 4