The given expression 12(2j – 6).

(Apply distributive property: a(b – c) = ab – ac)

= 12 x 2j – 12 x 6     (Distribute 12)

= 24j – 72                 (Multiply: 12 x 2j = 24j and  12 x 6 = 72)

The simplified expression is 24j – 72.