Question

How do you simplify `(d^2)-4`?

Answer 1

We know that `color(blue)(a^2 - b^2 = (a+b)(a-b)`

And `d^2 - 4 = d^2 - 2^2`

Using the identity, we can write `d^2 - 2^2` as `color(green)((d+2)(d-2)`