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At what value of x is the function y = x2 – 2x – 3…

At what value of x is the function y = x2 – 2x – 3 minimum?
  • A.
    1
  • B.
    -1
  • C.
    -4
  • D.
    4
Correct Answer: Option A
Explanation

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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