Question

Factorise the following.
x^2-4

Answer 1

(x - 2)(x + 2)

Explanation:

x² - 4 ← is a difference of squares and factors in general as

a² - b² = (a - b)(a + b) , then

x² - 4

= x² - 2²

= (x - 2)(x + 2) ← in factored form