X²-2X+17= X²-2X+1+16=(X+1)²-(-16)= =(X+1)²-(4²i²)=(X+1)²- (4i)²=
= (X+1+4i)(X+1-4i)
(здесь i²= -1)
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X²-2X+17= X²-2X+1+16=(X+1)²-(-16)= =(X+1)²-(4²i²)=(X+1)²- (4i)²=
= (X+1+4i)(X+1-4i)
(здесь i²= -1)