Explanation:
For a polynomial of the form
a
x
2
+
b
x
+
c
, rewrite the middle term as a sum of two terms whose product is
a
⋅
c
=
6
⋅
−
12
=
−
72
and whose sum is
b
=
−
1
.
−
1
out of
−
x
.
6
x
2
−
(
x
)
−
12
Rewrite
−
1
as
8
plus
−
9
6
x
2
+
(
8
−
9
)
x
−
12
Apply the distributive property.
6
x
2
+
8
x
−
9
x
−
12
Factor out the greatest common factor from each group.
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2
x
(
3
x
+
4
)
−
3
(
3
x
+
4
)
Factor the polynomial by factoring out the greatest common factor,
3
x
+
4
.
(
3
x
+
4
)
(
2
x
−
3
)