calculus
posted by tommy .
write the expression in the form bi, where b is the real number
squareroot16
squareroot25
squareroot3
squareroot5

what is 4i squared? 5i?

âˆš16
= âˆš1âˆš16
= 4i
now you do the others the same way. 
sqrt(16)=sqrt(1)sqrt(16)=i sqrt(16)=4i
sqrt(25)=sqrt(1)sqrt(25)=i sqrt(25)=5i
I think you can see it now. Just remember i=sqrt(1). And don't forget your properties of sqroots.