Question

help please.
Evaluate.
(2+i)/2-i

Answer 1

multiply by (2+i)/(2+i)

Answer 2

(2-i)(2+i)=4-i^2=5

Answer 3

i don't get how it equals 5?

Answer 4

the expression is not equal to 5; the denominator is.
(2+i)(2+i)/((2-i)(2+i))=(2+i)^2/5=(3+4i)/5

Answer 5

oh ok

Answer 6

hopefully that helps :)

Answer 7

thank you!