Explanation:
f(x)=3x3−21x2+36xf(x)=3x3-21x2+36x
Set 3x3−21x2+36x3x3-21x2+36x equal to 00.
3x3−21x2+36x=03x3-21x2+36x=0
by Solving for x
x=0,4,3
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