Strategy
:
Arrange polynomials in columns by degree.
Change the sign of
ALL
terms in the bottom polynomial.
Add the coefficients in each column.
Subtract
:
3x
3
+ 4x
2
-
5x + 7
-
x
3
+ 3x
-
7
2x
3
+ 4x
2
-
2x
Change signs below, and add
:
Add
:
3x
3
+ 4x
2
-
5x + 7
+
x
3
-
3x
+
7
4x
3
+ 4x
2
-
8x + 14
Answer is
:
4x
3
+ 4x
2
-
8x + 14
