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Byju's Answer
Standard XII
Mathematics
Integration by Partial Fractions
If α , β ar...
Question
If
α
,
β
are the roots of
x
2
−
(
k
+
1
)
x
+
1
2
(
k
2
+
k
+
1
)
=
0
,
then show that
α
2
+
β
2
=
k
.
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Solution
α
2
+
β
2
=
(
α
+
β
)
2
−
2
α
β
=
(
k
+
1
)
2
−
2
×
1
2
(
k
2
+
k
+
1
)
since
α
+
β
=
−
b
a
=
k
+
1
;
α
β
=
c
a
=
1
2
(
k
2
+
k
+
1
)
=
k
2
+
2
k
+
1
−
k
2
−
k
−
1
∴
α
2
+
β
2
=
k
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0
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