Because 4M and n are reciprocal, and n is the largest negative integer,
So: n=- 1, m= 1/4.
4M+2 square -8MN+5
=(4× 1/4+2)^2-8× 1/4×(- 1)+5
=9-(-2)+5
= 16
I hope I can help you. Ask if you have any questions ~ ~ ~
I wish you progress in your studies and go up a storey still higher! (*^__^*)