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

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

b. f(x) = 2x2 − 4x + 7

c. f(x) = 5 − 7x − 2x2 

d. f(x) = x3 − 12x2 + 2

e. f(x) = 2x3 − 15x2 + 24x + 6 

f. f(x) = 16 + 16x − x2 − x3

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