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f(2)=0 mamy wiec rownanie:
2 ( 1 - ImI )*2 + 4=0
4 ( 1 - ImI ) + 4=0
4 ( 1 - ImI ) = -4//:4
1 - ImI= -1
- ImI= -1-1
- ImI= -2//*( -1 )
ImI=2 ⇔ m= -2 ∨ m=2
Odp.: m ∈ { -2 ; 2 }