Question

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Answer 1

Answer:

$9a^2-4b^2$ is the correct answer.

Step-by-step explanation:

Difference of squares can be written as a^2 - b^2. This is equal to (a - b)(a + b)

In your answers, we see, 9a^2 - 4b^2. They are subtracting which is correct. 9 and 4 can also be rooted. 9 to 3 and 4 to 2 so

$9a^2-4b^2$ can be written as $(3a-2b)(3a+2b)$