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Byju's Answer
Standard XII
Mathematics
Special Integrals - 2
Resolve each ...
Question
Resolve each of the following quadratic trinomial into factor:
7x − 6x
2
+ 20
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Solution
The
given
expression
is
7
x
-
6
x
2
+
20
.
(
Coefficient
of
x
2
=
-
6
,
coefficient
of
x
=
7
and
constant
term
=
20
)
We
will
split
the
coefficient
of
x
into
two
parts
such
that
their
sum
is
7
and
their
product
equals
the
product
of
the
coefficient
of
x
2
and
the
constant
term
,
i
.
e
.
,
(
-
6
)
×
20
=
-
120
.
Now
,
15
+
(
-
8
)
=
7
and
15
×
(
-
8
)
=
-
120
Replacing
the
middle
term
7
x
by
15
x
-
8
x
,
we
get
:
7
x
-
6
x
2
+
20
=
-
6
x
2
+
7
x
+
20
=
-
6
x
2
+
15
x
-
8
x
+
20
=
(
-
6
x
2
+
15
x
)
+
(
-
8
x
+
20
)
=
3
x
(
-
2
x
+
5
)
+
4
(
-
2
x
+
5
)
=
(
3
x
+
4
)
(
-
2
x
+
5
)
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