F
a
c
t
o
r
i
z
e
t
h
e
e
x
p
r
e
s
s
i
o
n
:
(
2
a
+
1
)
3
+
(
a
-
1
)
3
Match the items on the right to the items on the left.
Check
OK
STEP1
STEP2
STEP3
STEP4
STEP5