# How do you factor completely 4x^2-49?

$\left(2 x + 7\right) \left(2 x + 7\right)$
${x}^{2} - {y}^{2} = \left(x + y\right) \left(x - y\right)$
$\left(2 x + 7\right) \left(2 x + 7\right)$