Hello :)The first thing you want to do is use foil F- first O- outer I-inner L-last Lets start with F ( first)6 × 3 = 18Now, lets do O (outer)6 × 2√10 = 12√10how to do it ?(6×2=12 and keep √10)Then, we are going to do I ( inner)(-√5) × 3= -3√5how to do it ?remove the parenthesis -√5 × 3= -3√5Lastly, we are going to do L (last)(-√5) × 2 √10= -10√2how to do it ?remove the parenthesis from (-√5), then factor 2 √10-√5 × 2[tex]\sqrt{5*2}[/tex]-√5 × 2 √5√2there are two 5's so we use our radical rule √a√a=a-2 × 5√2=-10√2The last thing you have to do is put them all together18+12√20-3√5-10√2