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JAMB Mathematics 1978 Question 22

Question 22

Differentiation

The minimum point on the curve y = x2 − 6x + 5 is at

  1. A.(1,5)
  2. B.(2,3)
  3. C.(−3,−4)
  4. D.(−3,4)
  5. E.(3,−4).
Show the answer and explanation

Answer: E ((3,−4).)

Explanation

dy/dx = 2x − 6 = 0 gives x = 3, and y = 9 − 18 + 5 = −4.