Multiplication of Polynomials
(
-7
x
2
+
5
x
-
3
)
(
-3
x
2
+
4
x
+
7
)
=
(
-7
x
2
)
(
-3
x
2
+
4
x
+
7
)
+
(
5
x
)
(
-3
x
2
+
4
x
+
7
)
+
(
-3
)
(
-3
x
2
+
4
x
+
7
)
=
(
-7
x
2
)
(
-3
x
2
)
+
(
-7
x
2
)
(
4
x
)
+
(
-7
x
2
)
(
7
)
+
(
5
x
)
(
-3
x
2
)
+
(
5
x
)
(
4
x
)
+
(
5
x
)
(
7
)
+
(
-3
)
(
-3
x
2
)
+
(
-3
)
(
4
x
)
+
(
-3
)
(
7
)
=
21
x
4
-
28
x
3
-
49
x
2
-
15
x
3
+
20
x
2
+
35
x
+
9
x
2
-
12
x
-
21
=
(
21
x
4
)
+
(
-28
x
3
-
15
x
3
)
+
(
-49
x
2
+
20
x
2
+
9
x
2
)
+
(
35
x
-
12
x
)
+
(
-21
)
=
21
x
4
-
43
x
3
-
20
x
2
+
23
x
-
21
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Copyright © Dayal D. Purohit, Ph.D.(Mathematics)