Factorize :
a
4
-
6
a
2
b
2
+
9
b
4
-
81
Matching exercise
Match the items on the right to the items on the left.
Check
OK
Step 1
Step 2
Step 3
Step 4
a
4
-
6
a
2
b
2
+
9
b
4
-
81
=
a
4
-
6
a
2
b
2
+
9
b
4
-
81
=
a
2
2
-
2
×
a
2
×
3
b
2
+
3
b
2
2
-
9
2
=
a
2
-
3
b
2
2
-
9
2
=
a
2
-
3
b
2
+
9
a
2
-
3
b
2
-
9