checking for accuracy

[Sissy Devane]

9 sqrt80 - 7 sqrt5
9 sqrt 16*sqrt5 - 7 sqrt5
9*4sqrt5 - 7 sqrt5
36 sqrt5 - 7 sqrt5
36 -7sqrt5
29sqrt5
this is the answer I came out with have I done the steps correctly to ge the outcome?

 

[Aladdin]

9 sqrt80 - 7 sqrt5
9 sqrt 16*sqrt5 - 7 sqrt5
9*4sqrt5 - 7 sqrt5
36 sqrt5 - 7 sqrt5(\sqrt5)(36-7)=\sqrt5(29)
36 -7sqrt5
29sqrt5
this is the answer I came out with have I done the steps correctly to ge the outcome?

Correct !

 

[Deleted member 4993]

9 sqrt80 - 7 sqrt5
9 sqrt 16*sqrt5 - 7 sqrt5
9*4sqrt5 - 7 sqrt5
36 sqrt5 - 7 sqrt5(\sqrt5)(36-7)=\sqrt5(29) It is advisable to write (36-7) in front of /sqrt - to avoid confusion.
(36 -7)sqrt5
29sqrt5
this is the answer I came out with have I done the steps correctly to ge the outcome?

Correct !