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