Answer:
V = 3a³ + 18a² + 24a
Explanation:
The volume (V) is the product of the 3 dimensions, that is
V = 3a(a + 2)(a + 4) ← expand factors using FOIL
= 3a(a² + 6a + 8) ← distribute parenthesis by 3a
= 3a³ + 18a² + 24a
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