*basically you write the function in its simplest term where you cannot
simplify it further
So:
[tex]30x^3+10x^2 = 10(3x^3+x^2) = 10x^2(3x+1)[/tex]
Answer: [tex]30x^3+10x^2[/tex] when factorized ⇒ [tex]10x^2(3x+1)[/tex]
Hope that helps!