Digital PSAT Math Practice Question 175: Answer and Explanation

Question: 175

What is the difference between 7a2 + 3ab - 8b and -2a2 + ab - 2b?

  • A. 5a2 + 4ab - 10b
  • B. 9a2 + 4ab - 8b
  • C. 9a2 + 2ab - 6b
  • D. 7a + 3ab - 10

Correct Answer: C

Explanation:

(C) The difference between two terms is the result when you subtract one term from another. Let us subtract one term from another-this is easiest to do if you place one term over the other so you can easily match up common terms and carefully apply the negative sign:

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