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Find the coordinates of the point on the curve \(y = x^{2} + 4x -...

Further Mathematics
WAEC 2006

Find the coordinates of the point on the curve \(y = x^{2} + 4x - 2\), where the gradient is zero.

  • A. (-2, 10)
  • B. (-2, 2)
  • C. (-2, -2)
  • D. (-2, -6)
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Correct Answer: Option D
Explanation

\(y = x^{2} + 4x - 2\)

\(\frac{\mathrm d y}{\mathrm d x} = 2x + 4 = 0\)

\(2x = -4 \implies x = -2\)

\(y(-2) = (-2^{2}) + 4(-2) - 2 = 4 - 8 - 2 = -6\)

\(\therefore (x, y) = (-2, -6)\)


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Post-UTME Past Questions - Original materials are available here - Download PDF for your school of choice + 1 year SMS alerts