Factor 3am^2-3an^2

$3 a m^{2} - 3 a n^{2}$

Factor $3 a$ out of $3 a m^{2} - 3 a n^{2}$ .

Factor $3 a$ out of $3 a m^{2}$ .

$3 a (m^{2}) - 3 a n^{2}$

Factor $3 a$ out of $- 3 a n^{2}$ .

$3 a (m^{2}) + 3 a (- 1 n^{2})$

Factor $3 a$ out of $3 a (m^{2}) + 3 a (- 1 n^{2})$ .

$3 a (m^{2} - 1 n^{2})$

Factor.

Since both terms are perfect squares, factor using the difference of squares formula, $a^{2} - b^{2} = (a + b) (a - b)$ where $a = m$ and $b = n$ .

$3 a ((m + n) (m - n))$

Remove unnecessary parentheses.

$3 a (m + n) (m - n)$