factor each polunomial completely. May I get some help please?

x2(squared)-4

1X2-4=1x2+(-4)=
-3x?
I'm not sure I know how to factor
`')brie~

To indicate x squared, use x^2. You need to get the numerical product of 4 without getting a middle x term. This means that the numerical terms must multiply to give you 4 but be equal and have opposite signs (one positive and one negative), so the two x terms cancel each other out.

x^2-4 = (x-2)(x+2)

Check it by multiplying.

(x-2)(x+2) = x^2-2x+2x-4 = x^2-4

I hope this helps you to understand the process. Thanks for asking.