To factor 9x^2-4 you can first rewrite the expression as

Step-by-step explanation:

The given expression is

We can write and 4 can be written as square of 2. 4 =

Therefore, we can write

Now we can factor it out.

We are asked to rewrite the expression.

Therefore, the answer is

Let me factor this expression for your reference.

b. 153 students do not participate in sports and seventy-five 12th graders were surveyed

if you was gonna solve for a, a is a   < -12