Complete the Expression: (9×7×4) Raised to Power a

To solve this problem, let's apply the rule for the power of a product, which states that when a product is raised to a power, each factor is raised to that power.

• Step 1: Write down the expression: $(9 \times 7 \times 4)^a$.
• Step 2: Apply the power of a product rule: $(x \times y \times z)^n = x^n \times y^n \times z^n$.
• Step 3: Raise each factor in the expression to the power $a$.
• Step 4: Simplify the individual expressions: $9^a \times 7^a \times 4^a$.

Thus, the expression $(9 \times 7 \times 4)^a$ simplifies to $9^a \times 7^a \times 4^a$.

The correct answer is $9^a \times 7^a \times 4^a$, which corresponds to choice 2.