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

Mathematics
JAMB 1978

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

  • A. (1, 5)
  • B. (2, 3)
  • C. (-3, -4)
  • D. (3, -4)
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Correct Answer: Option D
Explanation

Given the curve \(y = x^{2} - 6x + 5\)

At minimum or maximum point, \(\frac{\mathrm d y}{\mathrm d x} = 0\)

\(\frac{\mathrm d y}{\mathrm d x} = 2x - 6\)

\(2x - 6 = 0 \implies x = 3\)

Since 3 > 0, it is a minimum point.

When x = 3, \(y = 3^{2} - 6(3) + 5 = -4\)

Hence, the turning point has coordinates (3, -4).


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