Answer:

letter C

Step-by-step explanation:

(3a+9)(3a-9) ang answer

Answer:

D is the answer

Solution:

Step 1:

3^2 ⋅ a^2 - 3^4

Step 2:

3^2 (3^2 ⋅ a^2/3^2 - 3^4/3^2)

Step 3:

9(a^2 - (3^4-2) ) : Explanation: Subtract the 4 exponent to the 2 exponent

Step 4:

9(a^2 - (3^2) )

Step 5:

9(a^2 - 9)

Step 6:

9(a^2 - 3^2)

Step 7:

9( (a - 3) (a + 3) )

Answer:

9 (a - 3) (a + 3)

Hope it helps!