Question

What is the square root of -72

Answer 1

\(\Large\sqrt{-72}\)
like this?

Answer 2

what do you think is the answer?

Answer 3

6 sqrt 2i

Answer 4

@asnaseer

Answer 5

perfect! :)

Answer 6

i apparently got it wrong

Answer 7

I assume you are saying: \(6i\sqrt{2}\)

i.e. the "i" in not inside the squareroot symbol

Answer 8

i.e. the "i" IS not inside...

Answer 9

oh no, i was saying \[6\sqrt{2i}\]

Answer 10

ah - thats where you went wrong then...

think of it like this:\[\sqrt{-72}=\sqrt{72}\times\sqrt{-1}=6\sqrt{2}\times i=6i\sqrt{2}\]

Answer 11

oh okay that makes much more since, thanks!

Answer 12

yw :)