#2**+1 **

8r sqrt 2r.

Welcome.

Hope this helps a little bit, sorry I don't have too much time for explanation. (and I don't understand why latex does not work here)

Guest Nov 12, 2018

edited by
Guest
Nov 12, 2018

#3**+3 **

\(\sqrt{128r^3}=\sqrt{64 \times 2 \times r^2 \times r }=\sqrt{64} \sqrt{r^2} \sqrt{2r}=8r\sqrt{2r}\)

**Hope this helps!**

Dimitristhym Nov 12, 2018