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Simplify (2z(z+5)(z^2+2z-8))/((z-1)(z+5)(z-2))
2
z
(
z
+
5
)
(
z
2
+
2
z
-
8
)
(
z
-
1
)
(
z
+
5
)
(
z
-
2
)
Step 1
Cancel the
common factor
of
z
+
5
.
Cancel the
common factor
.
2
z
(
z
+
5
)
(
z
2
+
2
z
-
8
)
(
z
-
1
)
(
z
+
5
)
(
z
-
2
)
Rewrite the
expression
.
2
z
(
z
2
+
2
z
-
8
)
(
z
-
1
)
(
z
-
2
)
2
z
(
z
2
+
2
z
-
8
)
(
z
-
1
)
(
z
-
2
)
Step 2
Factor
z
2
+
2
z
-
8
using the AC method.
Consider the form
x
2
+
b
x
+
c
. Find a pair of
integers
whose
product
is
c
and whose
sum
is
b
. In this case, whose
product
is
-
8
and whose
sum
is
2
.
-
2
,
4
Write the factored form using these
integers
.
2
z
(
(
z
-
2
)
(
z
+
4
)
)
(
z
-
1
)
(
z
-
2
)
2
z
(
z
-
2
)
(
z
+
4
)
(
z
-
1
)
(
z
-
2
)
Step 3
Cancel the
common factor
of
z
-
2
.
Cancel the
common factor
.
2
z
(
z
-
2
)
(
z
+
4
)
(
z
-
1
)
(
z
-
2
)
Rewrite the
expression
.
2
z
(
z
+
4
)
z
-
1
2
z
(
z
+
4
)
z
-
1
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