Question 409850
 {{{a^4-1296}}}
{{{(a^2 + 36)*(a^2 - 36)}}}
{{{(a^2 + 36)*(a + 6)*(a - 6)}}}
and, also:
{{{a^2 = -36}}}
{{{a = 6i}}} and
{{{a = -6i}}}
{{{a^2 + 36 = (a + 6i)*(a - 6i)}}}
The complete factoring is
{{{(a + 6i)*(a - 6i)*(a + 6)*(a - 6)}}}