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WAEC Mathematics 2004 Question 20

Question 20

Quadratic Equations

Solve the equation 10 − 3x − x2 = 0

  1. A.x = 2 or −5
  2. B.x = −2 or 5
  3. C.x = 1 or 10
  4. D.x = 2 or 5
Show the answer and explanation

Answer: A (x = 2 or −5)

Explanation

x2 + 3x − 10 = (x + 5)(x − 2) = 0, so x = 2 or −5.