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Byju's Answer
Standard XII
Mathematics
Nature of Roots
if the roots ...
Question
if the roots of the equation a(b-c)x^2+b(c-a)x+c(a-b)=0 are equal and a,b,c>0, then prove that 2/b=1/a+1/c, i.e., a,b,c are in H.P.
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Similar questions
Q.
If the roots of the equation
a
(
b
−
c
)
x
2
+
b
(
c
−
a
)
x
+
c
(
a
−
b
)
=
0
are equal then prove that
2
b
=
1
a
+
1
c
i.e.
a
,
b
,
c
are in H.P.
Q.
(a) If the roots of the equation,
(
b
−
c
)
x
2
+
(
c
−
a
)
x
+
(
a
−
b
)
=
0
be equal, then prove thar a,b,c are in arithmetical progression.
(b) If
a
(
b
−
c
)
x
2
+
b
(
c
−
a
)
x
+
c
(
a
−
b
)
=
0
has equal roots, prove that a,b,c are in harmonical progression.
Q.
If
a
,
b
,
c
are in H.P., then the equation
a
(
b
−
c
)
x
2
+
b
(
c
−
a
)
x
+
c
(
a
−
b
)
=
0
Q.
If
a
(
b
−
c
)
x
2
+
b
(
c
−
a
)
x
+
c
(
a
−
b
)
=
0
has equal root, then
a
,
b
,
c
are in
Q.
If
a
,
b
,
c
are rational and no two of them are equal, then the quadratic equations
(
b
−
c
)
x
2
+
(
c
−
a
)
x
+
a
−
b
=
0
and
a
(
b
−
c
)
x
2
+
b
(
c
−
a
)
x
+
c
(
a
−
b
)
=
0
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