Final answer:
The quadratic function f(x) = 3x² - 4x is already in standard form, which is ax² + bx + c, so the answer is C) f(x) = 3x² - 4x.
Step-by-step explanation:
The student has asked to rewrite the quadratic function f(x) = 3x² - 4x in standard form. The standard form of a quadratic function is ax² + bx + c, where a, b, and c are constants.
Since the function provided is already in the form of ax² + bx, where a = 3 and b = -4, and there's no constant term (c), we can conclude that the function is already in standard form. Therefore, the answer is C) f(x) = 3x² - 4x.