Answer
$x=-6,6$; Warrick forgot to write the negative answer.
Work Step by Step
Isolate the variable factor on one side, and then take the $n$th root of both sides to solve for the variable. If the root is even, there will be a positive and negative answer. If the root is odd and the other side is negative, there is only a negative answer.
$x^4=1296$
$x=\sqrt[4] {1296}$
$x=-6,6$
Warrick forgot to write the negative answer.