SAT Math Multiple Choice Question 588: Answer and Explanation
3. Which of the following are solutions to the quadratic equation (x + 3)2 = 16?
- A. x = –19 and x = 13
- B. x = –7 and x = 1
- C. x = –1 and x = 1
- D. x = –1 and x = 7
Correct Answer: B
Category: Passport to Advanced Math / Quadratics
Strategic Advice: Notice the structure of the equation. The expression on the left side of the equation is the square of a quantity, so start by taking the square root of both sides.
Getting to the Answer: After taking the square roots, solve the resulting equations. Remember, 42 = 16 and (–4)2 = 16, so there will be two equations to solve.