Question on: JAMB Mathematics - 2010
At what value of X does the function y = -3 - 2x + X2 attain a minimum value?
A
-1
B
14
C
4
D
1
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Correct Option: D
Given that y = -3 - 2x + X2
then, \(\frac{dy}{dx}\) = -2 + 2x
At maximum value, \(\frac{dy}{dx}\) = O
therefore, -2 + 2x
2x = 2
x = 2/2 = 1
then, \(\frac{dy}{dx}\) = -2 + 2x
At maximum value, \(\frac{dy}{dx}\) = O
therefore, -2 + 2x
2x = 2
x = 2/2 = 1
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