<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>
121 rounded to the nearest 100 is 100 because 121 is closer to 100 than 200. 252 rounded to the nearest hundred is 300 because 252 is closer to 300 than 100.
