application Finder delete folders together - applescript

Question

Below is my code:
set sourceFolder1 to (path to library folder as text) & "Frameworks:SDL_mixer.framework"
set sourceFolder2 to (path to library folder as text) & "Frameworks:SDL_ttf.framework"
set sourceFolder3 to (path to library folder as text) & "Frameworks:SDL_image.framework"
set folderList to {sourceFolder1, sourceFolder2}
tell application "Finder"
repeat with thisFolder in folderList
if exists folder thisFolder then
delete folder thisFolder
end if
end repeat
end tell
The problem with this code is: I have to give password for every framework I want to delete (to the trash folder), Is there a way to give the password only once for all deleting work?
I cannot use shell script with rm (because rm will move files to the trash folder, but without put back option).
I notice that when the frameworks are deleted, it says delete 1 item. But when I use Finder to delete multiple files, it says delete N items. How can I implement the same thing, instead of delete 1 item each time in my code, delete N items at once, of course give password only once as well. Thanks a lot.
LJ

Answer 1

Try this:
tell application "Finder" to delete {sourceFolder1, sourceFolder2, sourceFolder3}

Answer 2

First, thank you for all responses.
It is based on the code given by user309603, a little modification has been done.
set sourceFolder1 to (path to library folder as text) & "Frameworks:SDL_mixer.framework"
set sourceFolder2 to (path to library folder as text) & "Frameworks:SDL_ttf.framework"
set sourceFolder3 to (path to library folder as text) & "Frameworks:SDLimage.framework"
set list1 to {}
tell application "Finder"
activate
if exists folder sourceFolder1 then
set list1 to {sourceFolder1}
end if
if exists folder sourceFolder2 then
set list1 to list1 & sourceFolder2
end if
if exists folder sourceFolder3 then
set list1 to list1 & sourceFolder3
end if
delete list1
end tell
Thanks again for all the help!