- #1

- 285

- 13

## Homework Statement

How do I find the value of n?

## Homework Equations

I know that when it crosses x-axis y = 0

X

^{3}- X

^{2}- 20 =0

But don't know how to solve it from here

## The Attempt at a Solution

The marking scheme says 3.0 or 3.1

I couldn't get the answer even by substituting

I know I'm doing something stupid