Question

if tr(A)=2+i then tr((2-i)A)=

Answer 1

Answer:

Tr [(2-i)A]=(2+i)(2-i)=4+1=5

Answer 2

Answer:5

Step-by-step explanation:

Tr(A)=2+I

Tr(2-i)A=(2-i)Tr(A)

(2-i)(2+i)=2²-i²=4-(-1)=5. [As i²=-1]