x³+2x²+4x+8=0
Rearrange
x³ + 4x + 2x²+ 8 = 0
x ( x² + 4 ) + 2( x² + 4) = 0
(x + 2) ( x² + 4) = 0
The factors are;
(x + 2) (x² + 4)
(x²+ 4) can further be simplified to give (x- 2i) (x + 2i)
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