Factorize :
16
x
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
16
x
4
-
81
=
4
x
2
2
-
9
2
=
4
x
2
-
9
4
x
2
+
9
=
2
x
2
-
3
2
4
x
2
+
9
=
2
x
+
3
2
x
-
3
4
x
2
+
9