# SAT Math Multiple Choice Question 480: Answer and Explanation

Home > SAT Test > SAT Math Multiple Choice Practice Tests

### Test Information

- Use your browser's back button to return to your test results.
- Do more SAT Math Multiple Choice Practice Tests.

**Question: 480**

**15.** If the equation has solutions x1 and x2, what is the product of x1 and x2?

- A. –45
- B. –15
- C. –5
- D. 3

**Correct Answer:** A

**Explanation:**

A

Difficulty: Hard

Category: Passport to Advanced Math / Quadratics

Strategic Advice: This is a quadratic equation, so you need one side to equal 0 and then, best-case scenario, you'll be able to factor. If not, you can rely on the quadratic formula.

Getting to the Answer: First, subtract 3 from both sides of the equation. Then multiply everything by 9 to clear the fractions.

Each number in the equation is divisible by 2, so factor out a 2 and go from there.

The solutions are –15 and 3, but be careful! The question asks for the product of the solutions, so the correct answer is (–15)(3) = –45.