Final answer:
To factor the expression ×2 - 49, we can use the difference of squares formula to get (x + 7)(x - 7).
Step-by-step explanation:
To factor the expression ×2 - 49, we can use the difference of squares formula. The difference of squares formula states that when we have an expression of the form a² - b², we can factor it as (a + b)(a - b).
In this case, the expression is x² - 49. To apply the difference of squares formula, we can rewrite 49 as 7². Therefore, the expression can be factored as (x + 7)(x - 7).
So, the completely factored form of the expression x² - 49 is (x + 7)(x - 7).