If x-y=12 and xy=25/4,find x+y
As (x+y) 2
= x2+ 2xy+y2
=x2 - 2xy +y2 +4xy
= (x- y)2+4xy
=( 12 )2+ 4* 25/4
= 144+25= 169 = 132
Therefore, x+y = 13
If x-y=12 and xy=25/4,find x+y
As (x+y) 2
= x2+ 2xy+y2
=x2 - 2xy +y2 +4xy
= (x- y)2+4xy
=( 12 )2+ 4* 25/4
= 144+25= 169 = 132
Therefore, x+y = 13