. If = √28 + 5√12 and y = √37 + 10√12 ,what is the value of x-y/x+y ?
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Answer:
Correct option is C)
x=
3
28
,y=
3
27
Then
x+y−
x
2
+xy+y
2
1
=x+y−
(x−y)(x
2
+xy+y
2
)
x−y
=x+y−
x
3
−y
3
x−y
=x+y−
28+27
x−y
=x+y−(x−y)
=2y
=2×
3
27
=2×3=6
x+y−
x
2
+xy+yz
1
=6
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