Question

Și mai departe ,va rog frumos

Answer 1

i=i
i²=-1
i³=-i
i^4=1
(i-1)^4=i^4-C4^1*i³+C4^2i²-C4^3i+1
1-4!/1!*(4-1)!*(-i)+4!/2!(4-2)!*(-1)-4!/3!*(4-3)*i+1
1-4!/3!*(-i)+4!/2!*2!*(-1)-4!/3!*1!*i+1
1+3i-6-4i+1=-4-i
(1-i)*(-4-i)=-(1-i)*(4+i)=-(4-4i+i-i²)=-(4-3i+1)=-(5-3i)=-5+3i