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140
6
avatar+1317 

Help Me please.

 

Exercise:

 

Add √-9 + √-36

ManuelBautista2019  Feb 22, 2018
 #1
avatar+1770 
+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.

RainbowPanda  Feb 22, 2018
 #3
avatar+3023 
+4

Good job, RainbowPanda!

tertre  Feb 22, 2018
 #2
avatar+3023 
+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, \(3i+6i=\boxed{9i}\)

tertre  Feb 22, 2018
 #4
avatar+88871 
+2

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

 

 

cool cool cool

CPhill  Feb 22, 2018
 #5
avatar+3023 
+3

Thanks, CPhill! smiley

tertre  Feb 22, 2018
 #6
avatar+1317 
+2

Thank You all!!!

ManuelBautista2019  Feb 22, 2018

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