Question

Lify.
(√-4)(4√-25) help me i dont get how to do this

Answer 1

-40

Explanation:

The Concept here is Complex Numbers

where
`√(-1)=i \ and \ i^(2) = -1`

Then
`√(-4)=\sqrt{4i^(2) } =\sqrt{(2i)^(2) } =2i`

Also
`√(-25)=\sqrt{25i^(2) } =\sqrt{(5i)^(2) } =5i`

Then
`(√(-4) )(4√(-25) )=(2i)(4*5i)=40i^(2) =40*-1=-40`

Glad to Help:)