How do you factor x squared minus 4?

Answer 1

x2 - 4 is a special expression that is referred to as a difference of squares. Whenever an expression is in the format:

a2 - b2

it can be factored out as:

(a + b)(a - b)

In the case of x2 + 4, that would be:

(x + 2)(x - 2)