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Byju's Answer
Standard VIII
Mathematics
Factorisation by Regrouping Terms
Resolve each ...
Question
Resolve each of the following quadratic trinomial into factor:
7x
2
− 19x − 6
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Solution
The
given
expression
is
7
x
2
-
19
x
-
6
.
(
Coefficient
of
x
2
=
7
,
coefficient
of
x
=
-
19
and
constant
term
=
-
6
)
We
will
split
the
coefficient
of
x
into
two
parts
such
that
their
sum
is
-
19
and
their
product
equals
the
product
of
the
coefficient
of
x
2
and
the
constant
term
,
i
.
e
.
,
7
×
(
-
6
)
=
-
42
.
Now
,
(
-
21
)
+
2
=
-
19
and
(
-
21
)
×
2
=
-
42
Replacing
the
middle
term
-
19
x
by
-
21
x
+
2
x
,
we
have
:
7
x
2
-
19
x
-
6
=
7
x
2
-
21
x
+
2
x
-
6
=
(
7
x
2
-
21
x
)
+
(
2
x
-
6
)
=
7
x
(
x
-
3
)
+
2
(
x
-
3
)
=
(
7
x
+
2
)
(
x
-
3
)
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