+0

0
232
6
+1405

Exercise:

Feb 22, 2018

#1
+2448
+1

√-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.

Feb 22, 2018
#3
+4094
+4

Good job, RainbowPanda!

tertre  Feb 22, 2018
#2
+4094
+5

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, $$3i+6i=\boxed{9i}$$

.
Feb 22, 2018
#4
+99580
+2

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

Feb 22, 2018
#5
+4094
+3

Thanks, CPhill!

tertre  Feb 22, 2018
#6
+1405
+2

Thank You all!!!

Feb 22, 2018