Objective: To divide polynomials
using long and synthetic division ,
and to use the remainder and
factor theorems. |
How do you divide a polynomial by
another polynomial?
Perform long division, as you do
with
numbers! Remember, division is repeated
subtraction , so each time you have a new
term, you must ___________ it from the
previous term.
Work from left to right, starting with the
highest degree term.
Just as with numbers, there may be a
remainder left. The divisor may not go into
the dividend evenly. |
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| Dividing a poly by a Binomial
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Example
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| Example

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Missing Terms?
Write the
polynomial in ___________ ________.
If any power is missing , use a _______ to hold
the place of that term.
Divide as before. |
| Example

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Synthetic Division
a simpler process
(than long division) for
dividing a polynomial by a binomial
uses ___________ and part of the divisor |
| STEPS for synthetic Division
1. Write
polynomial in ___________ order of the degrees .
2. List the ___________. (If one power is missing, put a
zero to hold that place.)
3. Write the constant _____ of the divisor x - c to the left.
4. Bring down the ___________ coefficient.
5. ___________ the first coefficient by c , write the product
under the 2nd coefficient and add .
6. Multiply this sum by c , write it under the next
coefficient and add. ___________until all coefficients
have been used.
7. The numbers on the bottom row are
the coefficients of
the polynomial ___________. The first power on the
variable will be one _________ than the highest power in
the original polynomial. |
Example
Use Synthetic
Division: x3 – 7x – 6 by x + 2. |
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| The Remainder Theorem
If the polynomial f(x) is divided by x – c, then
the remainder is the ___________ f(c).
f(x) = (x – c)q(x) + r |
Example
Given f(x) = 3x3 + 4x2
– 5x + 3, use the
remainder theorem to find f(-4).
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| Dividing a poly by a Binomial
LONG DIVISION
If a binomial divides into a polynomial with
no remainder, the binomial is a ___________ of
the polynomial. |
Factor Theorem
For the polynomial f(x), if f(c) = 0, then x – c is
a factor of f(x)
Remember . . . If something is a factor, then
it divides the term evenly (with 0 remainder). |
| Example Solve
the equation 15x3 + 14x2 – 3x – 2 = 0,
given that -1 is a zero of
f(x) = 15x3 + 14x2 – 3x – 2. |
Determine if -1 is a zero of

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