Multiplication of Polynomials
(
-3
x
2
-
8
x
+
9
)
(
7
x
2
-
x
+
7
)
=
(
-3
x
2
)
(
7
x
2
-
x
+
7
)
+
(
-8
x
)
(
7
x
2
-
x
+
7
)
+
(
9
)
(
7
x
2
-
x
+
7
)
=
(
-3
x
2
)
(
7
x
2
)
+
(
-3
x
2
)
(
-
x
)
+
(
-3
x
2
)
(
7
)
+
(
-8
x
)
(
7
x
2
)
+
(
-8
x
)
(
-
x
)
+
(
-8
x
)
(
7
)
+
(
9
)
(
7
x
2
)
+
(
9
)
(
-
x
)
+
(
9
)
(
7
)
=
-21
x
4
+
3
x
3
-
21
x
2
-
56
x
3
+
8
x
2
-
56
x
+
63
x
2
-
9
x
+
63
=
(
-21
x
4
)
+
(
3
x
3
-
56
x
3
)
+
(
-21
x
2
+
8
x
2
+
63
x
2
)
+
(
-56
x
-
9
x
)
+
(
63
)
=
-21
x
4
-
53
x
3
+
50
x
2
-
65
x
+
63
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)