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Byju's Answer
Standard X
Mathematics
Nature of Roots
If α+β=5 and ...
Question
If
α
+
β
=
5
and
α
3
+
β
3
=
35
,
find a quadratic equation whose roots are
α
a
n
d
β
.
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Solution
We
have
α
+
β
=
5
and
α
3
+
β
3
=
35
=
>
(
α
+
β
)
3
-
3
αβ
(
α
+
β
)
=
35
=
>
(
5
)
3
-
3
αβ
×
5
=
35
=
>
125
-
15
αβ
=
35
=
>
15
αβ
=
125
-
35
=
90
=
>
αβ
=
90
15
=
6
We
know
that
if
α
and
β
are
the
roots
of
a
quadratic
equation
,
then
the
quadratic
equation
is
x
2
-
(
α
+
β
)
x
+
αβ
=
0
On
substituting
α
+
β
=
5
and
αβ
=
6
,
we
get
:
x
2
-
5
x
+
6
=
0
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0
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