Question on: JAMB Mathematics - 1991
At what value of x is the function y = x2 - 2x - 3 minimum?
A
1
B
-1
C
-4
D
4
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Correct Option: A
For y = ax2 - bx + c for minimum y
(\frac{dy}{dx}) = 2x - 2
= (\frac{dy}{dx}) = 0
∴ 2x - 2 = 0
x = 1
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