Help Me please.

√-9 + √-36

For √-9, apply the radical rule: √-9=√-1√-9

Apply imaginary number rule which is √-1=i

So √-9i

√9=3, so now we have 3i

Now for √-36, apply the radical rule first: √-36=√-1√36

(Imaginary number step) We have √-36i now.

√36=6

So we have 6i

We ended up with 3i+6i which is equal to 9i, and that's your answer.

First, we can apply the radical rule, to get $\sqrt{-1}\sqrt{9}$ . Then we can apply the imaginary rule, to get $\sqrt{9} i=3i$ . Doing the same thing with, $\sqrt{-36}$, we get $6i$ . So, $3i+6i=\boxed{9i}$

Good job, RP and tertre....!!!!!

Thank You all!!!