Question

factorization
$49x2 - 4y2$

Answer 1

$49 {x}^{2} - 4 {y}^{2} \\ \\ {(7x)}^{2} - {(2y)}^{2} \\ \\ (7x - 2y)(7x + 2y)$

Answer 2

49x^2 - 4y^2
(7x)^2 - (2y)^2
a^2 - b^2 = (a+b ) (a-b)
therefore ,,
(7x + 2y ) ( 7x - 2y)