Question

Simplify sqrt -72

Answer 1

negative 6 square root of 2
6 square root of negative 2
6 square root of 2 i
6 i square root of 2

Answer 2

I think it's D, any way you can help me work it out?

Answer 3

yes it's D

Answer 4

\[\sqrt{8 \times 9 \times -1}\]
\[2 \times 3 \sqrt{2} i\] as \[\sqrt{-1}=i\]

Answer 5

so \[\sqrt{-72}=6\sqrt{2} i\]