Question: Given f (x) = 3x 4 2x 3 + 7x 2, how many sign changes are there in the coefficients of f (x)?

Given f (x) = 3x4 − 2x3 + 7x − 2, how many sign changes are there in the coefficients of f (−x)?

(a) 0

(b) 1

(c) 2

(d) 3

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