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Answer:
D. 12x³ + 32x - 8
General Formulas and Concepts:
Pre-Algebra
Algebra I
Step-by-step explanation:
Step 1: Define
f(x) = 3x³ + 8x - 2
k(x) = 4x
k(f(x)) is x = f(x)
Step 2: Find k(f(x))