👤

(1-i)^16 este nr real

Răspuns :

((1-i)²)^8= (1-2i+i²)^8= (1-2i-1)^8=(-2i)^8=(-2)^8* i^8=
2^8 * (i)^(4*2)=2^8*1=2^8∈R
am tinut cont ca i^(4k)=1, unde k∈N


2^8=256, dar nu e nevoie