Optimitation under constraints

[engineertobe]

Find the absolute maximum and minimum values, and their locations, of the function f(x

y)=2x2−xy+y+4
on the region D=

(x

y)

0

x

3

0

y

7

.

 

[tkhunny]

Have you considered the first and second derivatives and their consequences? Of course, this won't help much on the borders.