When you are looking for a factor of a polynomial, how do you know what binomials to try?
In Try This 3 you will explore patterns that will help you determine which factors to try when you are trying to factor a polynomial.
Try This 3
-
- Use the factor theorem to determine if the following binomials are factors of the polynomial. Record your results in a table similar to the one that follows.
- Use the polynomials and factors listed in the table to determine the a-value of each factor. The first polynomial is already completed.
Polynomial |
Constant Term |
Factors x – a |
a |
P(x) = x3 + 2x2 − 5x − 6 |
−6 |
x − 2 |
2 |
x + 1 |
−1 |
x + 3 |
−3 |
P(x) = x3 + x2 − 10x + 8 |
8 |
x − 1 |
|
x − 2 |
|
x + 4 |
|
P(x) = x4 + 2x3 − 13x2 − 14x + 24 |
24 |
x − 1 |
|
x − 3 |
|
x + 2 |
|
x + 4 |
|
- Compare the value of the constant term in each polynomial to the value of a, and describe any patterns you find.
- Try the pattern you discovered in question 2 and state the possible values of a for the polynomial P(x) = x3 − 6x2 + 5x + 12.
Save your responses in your course folder.