# How do you factor 4n^2-49?

$4 {n}^{2} - 49 = {\left(2 n\right)}^{2} - {7}^{2} = \left(2 n - 7\right) \left(2 n + 7\right)$
${a}^{2} - {b}^{2} = \left(a - b\right) \left(a + b\right)$