Answer:
See below.
Step-by-step explanation:
To prove these expressions are equivalent, we need to set the two expressions equal to each other in an equation and substitute 3 for g.
15(3) - 2(2(3) + 6) = 11(3) - 12
15(3) - 2(6 + 6) = 11(3) - 12
15(3) - 2(12) = 11(3) - 12
45 - 24 = 33 - 12
21 = 21
