SAT Math Multiple Choice Question 934: Answer and Explanation

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Test Information

Question: 934

2. For what values of x is the equation 2x2 = 4x + 3 true?

  • A.
  • B.
  • C.
  • D.

Correct Answer: A



Difficulty: Medium

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).

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