Answer:
Maximum value of f(x,y) at (10,13)=74
Minimum value of f(x,y) at (10,0)=-56
Step-by-step explanation:
We are given that

Vertices are (0,0),(10,0) and (10,13)
Substitute x=0 and y=0

Substitute x=10 and y=0

Substitute x=10 and y=13

Maximum value of f(x,y) at (10,13)=74
Minimum value of f(x,y) at (10,0)=-56