1. 5.4 Subtracting Polynomials

2. - To subtract an integer without tiles, we add the opposite integers.
The ‘Additive Inverse’
So we distribute the negative sign to the terms inside the 2nd bracket. - + +

3. Or we can combine like terms and then add…

4. Using algebra tiles:
(3b2 – 2b – 1) – (-2b2 – b + 2)
To subtract, you have to take away
, , and
Because these tiles aren’t there to take away, you add zero pairs.

6. Now take away the tiles for (-2b2 – b + 2)
The remaining tiles represent : 5b2 – b - 3

7. Try these:
1) Symbolically (Using numbers and letters) a. (8f – 3) – (7f+5) b. (2 + 5g – 7g2) – (9g – 4g2 + 2) 2) With algebra tiles (-4v2 + 5v - 1) – (-3v2 + 4v – 2)

8. Homework assignment :
P. 234: #6, 7, 13, 15, then 14