SAT Math Multiple Choice Question 291: Answer and Explanation
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
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