# SAT Math Multiple Choice Question 942: Answer and Explanation

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**Question: 942**

**10.** Which of the following are zeros of the quadratic equation? (Note:)

- A.
- B.
- C.
- D.

**Correct Answer:** B

**Explanation:**

**B**

**Difficulty:** Easy

**Category:** Additional Topics in Math / Imaginary Numbers

**Strategic Advice:** The *zeros* of an equation are the same as its solutions. Take a peek at the answers. The *i*'s in some of the choices are a clue that solving by factoring may not be possible for an equation like this.

**Getting to the Answer:** Don't be tempted to use a factoring shortcut here-this is *not* a difference of two squares. The left side of the equation is a *sum* of two squares, so you cannot factor it. Instead, subtract 9 from both sides of the equation and use square rooting. Keep in mind that:

This means (B) is correct.