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Can someone please help me with this question? I can't solve it.?

Hi, I have tried to solve this and I can't. I am on my last try (4/5 only 1 try left!!) and I would really appreciate it if someone could solve this?

Find all critical numbers of,

f(x)=x^(4)*e^(-19x)

Hint:: f(x)=(4x^(3)−19x^(4))e^−(19x)

x=?

Express your answer using set notation. That is, list all solutions separated by commas and enclosed in braces { }.

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