Posted by Jack on .
I Don't Know What Is This Subject Called In English But It's About Complex Numbers
it says
25 = 16  9 i^2 = (4 ± 3i)
But My Teacher Says
25 = 25  0 i^2 = (5 ± 0i)
I Think My Teacher Is Wrong , The Result Is 25 But There Will Not Be Complex Number Because ( 0i = 0)
So Is My Teacher Wrong Or Not ?

Math 
Reiny,
both end statements are incorrect
(4 ± 3i) means (4+3i) OR (43i)
it has nothing to do with the multiplication of
(4+3i)(43i)
which would be
16  9i^2
= 16  (9)
= 25
your teacher should have said, (probably did)
(5 + 0i)(50i)
= 25  0i^2
= 25