PSAT Math Multiple-Choice Question 820: Answer and Explanation
Question: 820
4xn + x4n =
- A. 5x5n
- B. xn(4 + x3n)
- C. 5x4n2
- D. 4xn(1 + x3n)
Correct Answer: B
Explanation:
(B) Factor an xn out of the expression to get the answer:
4xn + x4n = xn(4 + x3n)
You cannot combine xn and x4n into one term because they are not raised to the same power.
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