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->, <->, <- notation q

A: If x = 3
B: x^2 = 9
write ->, <->, or <-, linking the statements.

Answer: ->

I don't understand why it isn't <-> because if x is 3 then obviously 3 squared is 9. It also works the other way because if x^2 = 9 then ONLY 3 could be the x value, nothing else squared gives 9. Why is the answer -> and not <->?
Original post by Magenta96
if x^2 = 9 then ONLY 3 could be the x value, nothing else squared gives 9.


Oh come on really?
Original post by Magenta96
A: If x = 3
B: x^2 = 9
write ->, <->, or <-, linking the statements.

Answer: ->

I don't understand why it isn't <-> because if x is 3 then obviously 3 squared is 9. It also works the other way because if x^2 = 9 then ONLY 3 could be the x value, nothing else squared gives 9. Why is the answer -> and not <->?


  ⟺  \iff

means "if and only if".

Note that (−a)2=(a)2(-a)^2=(a)^2
(edited 11 years ago)
Original post by Mr M
Oh come on really?


PRSOM!
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Avatar for Magenta96
Magenta96
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Original post by Mr M
Oh come on really?


OH, I had a blank moment and completely forgot about -3 x -3 lol, sorry
Original post by Magenta96
OH, I had a blank moment and completely forgot about -3 x -3 lol, sorry


:smile:

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