SAT Math Multiple Choice Question 934: Answer and Explanation
2. For what values of x is the equation 2x2 = 4x + 3 true?
Correct Answer: A
Category: Passport to Advanced Math / Quadratics
Strategic Advice: Take a peek at the answer choices-they contain radicals, so your best bet is using the quadratic formula to solve the equation.
Getting to the Answer: First, write the equation in the form ax2 + bx + c = 0:
Next, jot down the values that you'll need: a = 2, b = -4, and c = -3. Then, substitute these values into the quadratic formula and simplify:
This isn't one of the answer choices, so you'll need to simplify the radical:
The correct answer is (A).