-3(n -3).4

If that is

-3(n -3)(4),

then it does not matter whether you multiply by the -3 first or by the 4 first.

If by the -3 first:

-3(n -3)(4)

= (-3n +9)(4)

= -12n +36 -------------answer.

If by the 4 first:

-3(n -3)(4)

= -3(4n -12)

= -12n +36 ----------same as above.