The simplification of the given expression will be -17.
What is simplification?
The process of reducing the complex mathematical expressions into the simplest form is called simplification.
Given expression will be simplified as:-
= -3 ( y + 2 ) 2 - 5 + 6y
= ( -3y - 6 ) 2 - 5 + 6y
= ( -6y - 12 -5 + 6y )
= ( -17 )
Hence the simplification of the given expression will be -17.
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