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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:
3 + 23y − 8y
2
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Solution
The
given
expression
is
3
+
23
y
-
8
y
2
.
(
Coefficient
of
y
2
=
-
8
,
coefficient
of
y
=
23
and
constant
term
=
3
)
We
will
split
the
coefficient
of
y
into
two
parts
such
that
their
sum
is
23
and
their
product
equals
the
product
of
the
coefficient
of
y
2
and
the
constant
term
,
i
.
e
.
,
(
-
8
)
×
3
=
-
24
.
Now
,
(
-
1
)
+
24
=
23
and
(
-
1
)
×
24
=
-
24
Replacing
the
middle
term
23
y
by
-
y
+
24
y
,
we
have
:
3
+
23
y
-
8
y
2
=
-
8
y
2
+
23
y
+
3
=
-
8
y
2
-
y
+
24
y
+
3
=
(
-
8
y
2
-
y
)
+
(
24
y
+
3
)
=
-
y
(
8
y
+
1
)
+
3
(
8
y
+
1
)
=
(
3
-
y
)
(
8
y
+
1
)
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