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Byju's Answer
Standard X
Mathematics
Relationship between Zeroes and Coefficients of a Polynomial
If alpha, bet...
Question
If alpha, beta and gamma are the zeroes of the cubic polynomial x3+4x+2, then find the value of (1/alpha+beta) + (1/beta+gamma) + (1/alpha+gamma).
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Solution
Let
p
x
=
x
3
+
4
x
+
2
Now
,
α
+
β
+
γ
=
-
coefficient
of
x
2
coefficient
of
x
3
=
-
0
1
=
0
Now
,
αβ
+
βγ
+
γα
=
coefficient
of
x
coefficient
of
x
3
=
4
Now
,
αβγ
=
-
constant
term
coefficient
of
x
3
=
-
2
Now
,
α
+
β
+
γ
=
0
⇒
α
+
β
=
-
γ
;
β
+
γ
=
-
α
;
γ
+
α
=
-
β
Now
,
1
α
+
β
+
1
β
+
γ
+
1
γ
+
α
=
-
1
γ
-
1
α
-
1
β
=
-
αβ
-
βγ
-
γα
αβγ
=
-
αβ
+
βγ
+
γα
αβγ
=
-
4
-
2
=
2
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Similar questions
Q.
If
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________.
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