how to factor w^2r^2-1

To factor the expression w^2r^2 - 1, we can notice that it is in the form of a difference of squares. The difference of squares formula states that:

a^2 - b^2 = (a + b)(a - b)

In our case, a = w^2r^2, and b = 1. Applying the formula, we can write the expression as:

w^2r^2 - 1 = (w^2r + 1)(w^2r - 1)

So, the factored form of w^2r^2 - 1 is (w^2r + 1)(w^2r - 1).