book Maths Puzzle Numerical Ability

FORMULA: A= -5 (a +6)in ( a -6) in

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please help
simplify/reduce
(4-2radical3)^2
the conjugate of
sqare_root(2)-square_root(3) is:
square_root(2)+square_root(3).

But can it be:
-sqare_root(2)-square_root(3)?