SAT Math Multiple Choice Question 291: Answer and Explanation

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Test Information

Question: 291

6. The value of 7x2 + 3 is how much more than the value of 7x2 – 9?

  • A. 6
  • B. 12
  • C. 7x2 – 6
  • D. 7x2 + 12

Correct Answer: B

Explanation:

B

Difficulty: Medium

Category: Passport to Advanced Math / Exponents

Strategic Advice: When you find the language confusing, try to put it in concrete terms. If you wanted to know how much more 8 was than 5, what would you do? You would subtract 8 - 5 = 3 more. So you need to subtract these two algebraic expressions.

Getting to the Answer: Don't forget to distribute the negative when simplifying the difference:

(7x2 + 3) - (7x2 - 9) = 7x2 + 3 - 7x2 + 9 = 12

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