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
For y = ax2 – bx + c for minimum y
(frac{dy}{dx}) = 2x – 2
= (frac{dy}{dx}) = 0
∴ 2x – 2 = 0
x = 1