- #1
Taturana
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Consider square root of 4.
Can square root of 4 be +2 or -2?
I asked that to my math teacher so he said: NO, square root of 4 is +2!
But I can't really understand why it cannot be -2 since -2 squared is also 4. One thing I've imagined is: square root of 4 can be +2 or -2, but for CONVENTION we use +2. Is that right?
There's another question related to that: consider
[tex]i^2 = -1[/tex]
squaring the two sides we obtain
[tex]i^4 = 1[/tex]
so
[tex]i = 1[/tex]
so: can the i (the imaginary number) be 1? I think I'm making a lot of confusion with that, could someone explain me that?
Thank you
Can square root of 4 be +2 or -2?
I asked that to my math teacher so he said: NO, square root of 4 is +2!
But I can't really understand why it cannot be -2 since -2 squared is also 4. One thing I've imagined is: square root of 4 can be +2 or -2, but for CONVENTION we use +2. Is that right?
There's another question related to that: consider
[tex]i^2 = -1[/tex]
squaring the two sides we obtain
[tex]i^4 = 1[/tex]
so
[tex]i = 1[/tex]
so: can the i (the imaginary number) be 1? I think I'm making a lot of confusion with that, could someone explain me that?
Thank you