Question

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

Answer 1

Answer:

$(3x)^2 - 2^2$

Step-by-step explanation:

The given expression is $9x^2 - 4$

We can write $9x^2 = 3*3*x^2 = 3^2.y^2 = (3y)^2$ and 4 can be written as square of 2. 4 = $2^{2}$

Therefore, we can write $9x^2 - 4 = (3x)^2 - 2^2$

Now we can factor it out.

We are asked to rewrite the expression.

Therefore, the answer is $(3x)^2 - 2^2$

Let me factor this expression for your reference.

$(3x)^2 - 2^2 = (3x -2)(3x +2)$