Question

Factor the expression
6x^4 - 162x

Answer 1

Take out common numbers/variables in both terms;

6x(x³-27) 

Hope I helped :) 

Answer 2

Your answer is...
   6x(x³ - 27)
Due to if you do 6x^4 - 6x 
  which equals x³.
Due to if you 162x / 6x
  which equals 27.