Find the set of values of x for which each of the following is decreasing. a. f(x)

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Find the set of values of x for which each of the following is decreasing.
a. f(x) = 3x2 − 8x + 2 

b. f(x) = 10 + 9x − x2

c. f(x) = 2x3 − 21x2 + 60x − 5 

d. f(x) = x3 − 3x2 − 9x + 5

e. f(x) = −40x + 13x2 − x3 

f. f(x) = 11 + 24x − 3x2 − x3

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