PSAT Math Multiple-Choice Question 170: Answer and Explanation

Question: 170

Which of the following is equivalent to the expression above?

• A.
• B.
• C.
• D.

Correct Answer: C

Explanation:

C

Difficulty: Easy

Category: Passport to Advanced Math/Rational Expressions

Getting to the Answer: Don't be tempted—you can't simply cancel one term when a polynomial is divided by a monomial. You can, however, split the expression into three terms, each with a denominator of 9 x², and simplify. You could also use polynomial long division to answer the question. Use whichever method gets you to the answer more quickly on test day. For example:

Choice (C) is correct.