Question 15
Quadratic EquationsSolve for r in the following equation
1/(r − 1) + 2/(r + 1) = 3/r
- A.3
- B.4
- C.5
- D.6
Show the answer and explanation
Answer: A (3)
Explanation
Multiply through by r(r − 1)(r + 1): r(r + 1) + 2r(r − 1) = 3(r² − 1). This gives 3r² − r = 3r² − 3, so r = 3.