f(x) = (2x + 1)³
f(3) = (2 * 3 + 1)³ = (6 + 1)³ = 7³ = 343
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f(x) = (2x + 1)³
f(3) = (2 * 3 + 1)³ = (6 + 1)³ = 7³ = 343