Question

What is 5√-100?

Answer 1

You can never take the square root of a negative number
However you can split it up as
\[5\times \sqrt{100}\times \sqrt{-1}\]
What's the square root of a 100?

Answer 2

10

Answer 3

What's 5 times 10?

Answer 4

50

Answer 5

And then the square root of -1 is "i" so it becomes 50i

Answer 6

And that is your final answer