Posted by ladybug on Sunday, October 14, 2012 at 12:08am.
complex zeros always come in conjugate pairs
so if 4-3i is a root, so is 4+3i
so (x - 4 -3i)(x - 4 + 3i) will be a factor
= x^2 - 4x + 3ix - 4x + 16 - 12i - 3ix + 12i - 9i^2)
= x^2 - 8x + 25
Using long algebraic division
(x^4 - 12x^3 + 36x^2 + 68x - 525) / (x^2 - 8x + 25)
= x^2 - 4x - 21
so for x^2 - 4x - 21 = 0
(x-7)(x+3) = 0
x = 7 or x = -3
roots are :
-3 , 7 , 4+3i , 4-3i
=
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