Which expression is equivalent to 4/(4x - 5) - 1/(x + 1)?
A9 / ((x + 1)(4x - 5))
B3 / (3x - 6)
C1 / ((x + 1)(4x - 5))
D-1 / ((x + 1)(4x - 5))
Answer & Solution
Correct answer: A. 9 / ((x + 1)(4x - 5))
Common denominator (x+1)(4x-5). Numerator: 4(x+1) - (4x-5) = 4x + 4 - 4x + 5 = 9. So the difference is 9 / ((x+1)(4x-5)).
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