Unit 4 Polynomials Worksheet Page 7

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Subtracting Polynomials
!
1. align like terms in decending order
5��
+ 6�� + 2
(place a zero as a placeholder if needed)
!
7��
− 7�� + 5
2. change the sign of the second
!
5��
+ 6�� + 2
!
polynomial.
−7��
+ 7�� + 5
3. add down
!
−2��
+ 13�� + 7
examples:
!
!
!
(6��
– x + 1) – (–4 + 2��
+ 8x)
(4��
+ 8k + 2) – (2k + 3)
!
!
!
!
(10x – 7 + ��
+ 4��
) - (4x + 2��
– 6��
+ 2)
Perimeter
The measures of two sides of a triangle are given. If P is
the perimeter, and P = 10x + 5y, find the measure of the
third side.
Questions to ask in class

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