If y = x2 – 2x – 3, Find the least value of y and corresponding value of x
- x = 3, y = 3
- x = 1, y = -3
- x = 4, y = 1
-
x = 1, y = -4
- x = 2, y = -3
The correct answer is: D
Explanation
If the graph of eqn. y = x2 - 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