3. Find all the points on the graph of f(x) = 3x - 52x³ +300x² - 672x +900. For which the tangent line is horizontal. A) (2,388)

Question

3. Find all the points on the graph of
f(x) = 3x - 52x³ +300x² - 672x +900.
For
which the tangent line is horizontal.
A) (2,388) only
B) (2,0), (4,0) and (7,0)
c) (2,388), (4,452) and (7,263)
D) (4,452) and (7,263) only
E) (4,0) and (7,0) only

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