itute.com have published solutions to the general 2 here http://www.itute.com/wp-content/uploads/2018-NSW-ESA-Mathematics-General-2-Solutions.pdf
They will put up solutions to the 2u, ext1 and ext2 later too at http://www.itute.com/download-free-vce-maths-resources/free-maths-exams/
They will put up solutions to the 2u, ext1 and ext2 later too at http://www.itute.com/download-free-vce-maths-resources/free-maths-exams/