This is a question from the 2021 math advanced hsc paper. I'm confused with question 16 how do u know which values to sub for x?

Question 16 (3 marks) 3 For what values of x is f(x) =x2 - 2x3 increasing? - Differentiate 3 ......... Factorise . . . .. . for g 2 6 the graph for y- 2c ( )- 300) the e. ..graph.. is increasing when -13 - L Office Use Only - Do NOT write anything, or make any marks below this line. 79863103