## anonymous one year ago Simplify sqrt -72

1. anonymous

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

2. anonymous

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

3. sohailiftikhar

yes it's D

4. sohailiftikhar

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

5. sohailiftikhar

so $\sqrt{-72}=6\sqrt{2} i$