Question

Factor Completely: x^2 − 49

Answer 1

use this rule \[a^2-b^2=(a-b)(a+b)\]

Answer 2

It is just the reverse of the previous quest.

\((a+b)(a-b) = a^2- b^2\)

\(x^2-49\) is of the form \(a^2-b^2\)