Advanced MathEasySubtracting a binomial
Advanced Math practice question
A rope of length 5t is cut, and a piece of length 2t + 1 is removed. Which expression gives the length of the remaining rope?
- A. 3t − 1Correct
- B. 3t + 1
- C. 7t + 1
- D. 3t
Answer: A. 3t − 1
5t − (2t + 1) = 5t − 2t − 1 = 3t − 1.
Why the other answers are wrong
- B. 3t + 1
- The −1 comes from subtracting the whole piece, including its +1.
- C. 7t + 1
- 7t + 1 adds the piece instead of removing it.
- D. 3t
- 3t forgets the 1 in the removed piece.
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