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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
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