Respuesta :
We have to find f ( i ) for the function: f ( x ) = x³ - 2 x²
f ( i ) = i³ - 2 i²
We know that: i² = - 1 and i³ = - i
f ( i ) = - i - 2 · ( - 1 )
f ( i ) = - i + 2
The complex number is written in form: z = a + b i
Answer:
f ( i ) = 2 - i