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If y = x\(^2\) - 2x - 3, find the least value of y and...

Mathematics
JAMB 1979

If y = x\(^2\) - 2x - 3, find the least value of y and the corresponding value of x

  • A. x = 3, y = 3
  • B. x = 1, y = -3
  • C. x = 4, y = 1
  • D. x = 1, y = -4
  • E. x = 2, y = -3
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Correct Answer: Option D
Explanation

If the graph of eqn. y = x\(^2\) - 2x - 3 is plot and drawn, the lease value of y = -4 while the corresponding value of x = 1

x = 1, y = -4

OR

\(\frac{dy}{dx}\) = 0 = 2x - 2

2x = 2 

x = 1

put x = 1 in y = 2x\(^2\) - 2x - 3

y = - 4

x= 1, y = -4


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WAEC and NECO CBT App for Mobile Devices - Candidates, Schools, Centres, Resellers - 100% Offline -Download Now
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