

Critical points occur where the gradient is zero. This is guaranteed whenever

and either

or

.
The Hessian matrix for this function looks like

and has determinant

Maxima occur whenever the determinant is positive and

. Minima occur whenever both the determinant and

are positive. Saddle points occur whenever the determinant is negative.
At

, you have a saddle point since the determinant reduces to -324, so

is the saddle point.
At

, the determinant is

and

, so

is a local maximum.
No other critical points remain, so you're done.
Answer:
Step-by-step explanation:
2,314,976*5%= $115,748.80
Answer:
512 inches cubed
Step-by-step explanation:
2/3 of a foot= 8in
8x8x8 or 8^3= 512
512 inches cubed
The answer to your problem is A because you must add them altogether but i might be wrong im just trying to help you out