0x4E4F@sh.itjust.works to Math Memes@lemmy.blahaj.zoneEnglish · 6 months agoWTF 🤦sh.itjust.worksimagemessage-square56fedilinkarrow-up1117arrow-down10
arrow-up1117arrow-down1imageWTF 🤦sh.itjust.works0x4E4F@sh.itjust.works to Math Memes@lemmy.blahaj.zoneEnglish · 6 months agomessage-square56fedilink
minus-squarerasensprenger@feddit.delinkfedilinkEnglisharrow-up3·edit-26 months agoThe 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
minus-squaredigdug@kbin.sociallinkfedilinkarrow-up6·6 months agoAnd even if you allowed sqrt(4) = ±2, it would still be invalid to evaluate it to -2 on one side of the equation, but then use +2 on the other side.
minus-square0x4E4F@sh.itjust.worksOPlinkfedilinkEnglisharrow-up1·6 months agoOf course, you can only choose one at a time, not mix and match, lol 😂.
minus-square0x4E4F@sh.itjust.worksOPlinkfedilinkEnglisharrow-up2·edit-26 months agoOh yeah, you’re right, now I remembered 🤦. Been a while 😂, almost 20 years.
√4=±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) = ±2, 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 😂.
Oh yeah, you’re right, now I remembered 🤦. Been a while 😂, almost 20 years.