fossilesque@mander.xyzM to Science Memes@mander.xyzEnglish · 7 months agoteachingsmander.xyzimagemessage-square60fedilinkarrow-up1751arrow-down115
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minus-squarecriitz@reddthat.comlinkfedilinkEnglisharrow-up24·edit-27 months agoYou’re correct. The square root operator only returns the principal root (the positive one). So if x^2 = 9 then x = ±√9 = ±3 That’s why in something like the quadratic formula we all had to memorize in school its got a “plus or minus” in it: -b ± √…(etc)
minus-squareUnRelatedBurner@sh.itjust.workslinkfedilinkEnglisharrow-up8·7 months agoThanks, I haven’t connected the dots to that (±) sign and this problem.
You’re correct. The square root operator only returns the principal root (the positive one).
So if x^2 = 9 then x = ±√9 = ±3
That’s why in something like the quadratic formula we all had to memorize in school its got a “plus or minus” in it: -b ± √…(etc)
Thanks, I haven’t connected the dots to that (±) sign and this problem.