Find the maximum value of xy such as that x+y=8
sivaprasath:
answer is 7,. 7+1=8,. 7 x 1=7
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x+y=8
x=8-y,y=8-x
so, xy=8
(8-y) (8-x) =8
64-8x -8y+xy=8
56-8x -8y +xy
xy=-8(7-x-y)
x=8-y,y=8-x
so, xy=8
(8-y) (8-x) =8
64-8x -8y+xy=8
56-8x -8y +xy
xy=-8(7-x-y)
mistake:
ya
not mistake,..That guy just asked you to find the maximum value, not a value of x and y,.so,it must be numeric without any variable terms,.
The maximum value of xy=7,.
oo
its 16
thanx bro
sorry,16
4 x4=16
just edit it,bro
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