Answers

2015-12-15T09:29:18+05:30
X2+y2=41
(x-y)2 +2xy= 41
xy = 20

(x+y )2= (x-y)2 +4xy
            =  1 + 4x20
            = 81
x+y       = 9    Ans.
0
i think the answer is wrong!!!in the first part of the sum ,how did u get xy=20.i think it will be 19.5 because 41=2+2xy so 41-2=2xy which is 39/2=xy which is 19.5
but right answer is ±9
dear,i am confused!!!
right answer +9 or -9
ohk