Idon't know
There's nothing to solve, because there's no equation there. All we have is a 4th degree expression in 'x'. Its numerical value depends on the value of 'x'. An algebra teacher may ask you to factor it, but then the question would come from the teacher, not from the expression. If there were an 'equals' sign ( ' = ' ) somewhere here, then we would have an equation, and there would be something to solve.