Question

-3square root 18 -2square root 18 +3square root 2

Answer 1

write
\[\sqrt{18}=3\sqrt{2}\]
and continue

Answer 2

\(\Large \color{purple}{\rightarrow -3\sqrt{18} = -3\sqrt{2 * 3 * 3} = -3*3\sqrt2 = -9\sqrt{2} }\)

Just get them like this and get a common radical.

Answer 3

thanks