x-y=4,xy=23 then find x+y
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Hi ,
x - y = 4 ----( 1 )
xy = 23 -----( 2 )
We know that ,
( x + y )² = ( x -y )² + 4xy
= 4² + 4 × 23
[ From equations ( 1 ) and ( 2 ) ]
( x + y )² = 16 + 92
= 108
( x + y ) = ± √108
= ± √ (2 × 2 )×( 3 × 3) × 3
x + y = ± 6√3
I hope this helps you.
:)
x - y = 4 ----( 1 )
xy = 23 -----( 2 )
We know that ,
( x + y )² = ( x -y )² + 4xy
= 4² + 4 × 23
[ From equations ( 1 ) and ( 2 ) ]
( x + y )² = 16 + 92
= 108
( x + y ) = ± √108
= ± √ (2 × 2 )×( 3 × 3) × 3
x + y = ± 6√3
I hope this helps you.
:)
mmcian:
i was too close to the answer.thanks a lot
u'r welcome
:)
Answered by
1
I hope this help you......................
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