Final answer:
The antiderivative of 3x is 3/2x² + C.
Step-by-step explanation:
To calculate the antiderivative of 3x, we can use the power rule of integration. The power rule states that the antiderivative of xⁿ is (1/(n+1)) * xⁿ⁺¹ + C, where C is the constant of integration. Applying this rule to our problem, we have:
∫3xdx = (1/2) * x² + C
Hence, the accurate answer corresponds to A) 3/2x² + C, showcasing how the application of the power rule in integration enables the derivation of antiderivatives, providing a comprehensive method to find the reverse process of differentiation for various functions.