The minimum value of y in the equation y = x\(^2\) - 6x + 8 is
A
8
B
3
C
7
D
-1
Verified Correct Answer: D.
Step-by-Step Mathematical Solution
y = x\(^2\) - 6x + 8
\(\frac{dy}{dx}\) = 2x - 6
\(\frac{dy}{dx}\) = 0
2x - 6 = 0
x = 3
\(\therefore\) y = 3\(^2\) - 6(3) + 8
= 9 - 18 + 8
= -1
Source: Myschool Past Questions Archive (Record #31914)