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Find the values of x for which the following functions are strictly decreasiong:

f(x) = x3 – 9x2 + 24x + 12

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f(x) = x3 – 9x2 + 24x + 12

f is strictly decreasing if f'(x) < 0

∴ f is strictly decreasing if x ∈ (2, 4)

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