Advanced MathHardSubtracting fractions with the same denominator
Advanced Math practice question
For x ≠ −1, which expression is equivalent to x/(x + 1) − 1/(x + 1)?
- A. (x − 1)/(x + 1)Correct
- B. (x − 1)/(2x + 2)
- C. x − 1
- D. 1
Answer: A. (x − 1)/(x + 1)
Same denominator: subtract the numerators, x − 1, over x + 1.
Why the other answers are wrong
- B. (x − 1)/(2x + 2)
- (2x + 2) adds the denominators as well.
- C. x − 1
- x − 1 drops the denominator.
- D. 1
- 1 would need equal fractions, which they are not.
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