4 - v-45 simplify

Question

4 + 3i√5

4 + 3√5

4 - 3i√5

4 - 3i√-5

2 - 3i√5

Answer 1

4-√-45 

 

=4-√-1*5*9*

 

then √-1*5*9 = i*√5*√9

 

this is √9= 3 , √-1 =i

 

therefore

 

4-√-45 =4-3i√5

 

best regards,

carmen