Answers

2015-05-03T09:03:41+05:30
The maximum value of xy subject to x+y=8 will be 16 when x=4,y=4
4 3 4
2015-05-03T10:29:44+05:30
Xy = x(8-x)
     = 8x-x^2
for maximum , differentiate wrt x and equate to 0 
     =x=4
hence y=8-4
            =4
so the maximum value is 16 
0