<span>a2 – b2 = (a + b)(a – b) or (a – b)(a + b). This is the 'Difference of Squares' formula we can use to factor the expression.
In order to use the </span><span>'Difference of Squares' formula to factor a binomial, the binomial must contain two perfect squares that are separated by a subtraction symbol.
</span><span>x^2 - 4 fits this, because x^2 and 4 are both perfect squares, and they are separated by a subtraction symbol. All you do here to factor, is take the square root of each term.
√x^2 = x √4 = 2
Now that we have our square roots, x and 2, we substitute these numbers into the form (a + b)(a - b). </span> <span>(a + b)(a - b) (x + 2)(x - 2)
Our answer is final </span><span>(x + 2)(x - 2), which can also be written as (x - 2)(x + 2), it doesn't make a difference which order you put it in.
Anyway, Hope this helps!! Let me know if you need help understanding anything and I'll try to explain as best I can.</span>
