SAT Math Multiple Choice Question 439: Answer and Explanation
4. Given the function what domain value corresponds to a range value of
Correct Answer: B
Category: Passport to Advanced Math / Functions
Strategic Advice: Don't answer this question too quickly—you may be tempted to substitute for x, but is the output (range), not the input (domain).
Getting to the Answer: The given range value is an output value, so substitute for f(x) and use inverse operations to solve for x, which gives you the corresponding domain value. Start by multiplying the equation by the greatest common multiple of 3 and 4, which is 12, in order to clear the fractions.