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JAMB Mathematics 1997 Question 16

Question 16

Polynomials

Find the value of K if (5 + 2r)/((r + 1)(r − 2)) expressed in partial fraction is K/(r − 2) + L/(r + 1) where K and L are constants.

  1. A.3
  2. B.2
  3. C.1
  4. D.−1
Show the answer and explanation

Answer: A (3)

Explanation

5 + 2r = K(r + 1) + L(r − 2). Putting r = 2 gives 9 = 3K, so K = 3.