Algebra I Recipe: Adding and Subtracting Polynomials
By G Redden
- polynomial – has one or more terms
- monomial – has one term
- binomial – has two terms
- trinomial – has three terms
- degree of ONE term – it’s the sum of all exponents in the term.
- degree of a POLYNOMIAL:
- Find the degree of each term.
- The largest degree is the degree of the polynomial.
- standard form of a polynomial – terms written in order from largest degree to smallest degree.
- Change all subtraction to adding the opposite.
- Drop the parentheses.
- Combine like terms.
- State the answer in standard form.
1.
(-4x2 - 2x + 5) + (6x2 + 2x – 11)
2.
(9x3 + 3x2 - 24) + (-9x2 + 5x + 19)
- Change all subtraction to adding the opposite when necessary.
- The negative in front of the second set of parentheses is understood to be a –1.
- To eliminate the parentheses, distribute the –1. Remember that distributing by -1 will change each term to its opposite.
- Combine like terms.
- State the answer in standard form.
3.
(8x3 - 3x2 - 11x – 3) – (-13x3 - 3x2 + 2x – 17)
4.
(9x3 - 3x2 - 1) – (9x3 + 5x2 + 19)