Long Division and Synthetic Division - Murrieta Valley Unified School ...
Warm-up
Long Division and Synthetic Division Section 2.3 (Part 1)
1. Given f (x) = x4 - 102 - 2x + 4 , find f(-3).
2. Given f (x) = 3x3 + 8x2 + 5x - 7 , find f(-2).
Long Division of Polynomials Example 1 a) Given f (x) = 6x3 -19x2 + 16x - 4 and f (2) = 0 . Factor f(x) completely.
b) Given f (x) = x3 - 2x2 - 9 and f (3) = 0 . Factor f(x) completely.
Practice Problem 1 Given f (x) = 2x2 + 10x + 12 and f (-3) = 0 . Factor f(x) completely.
Example 2 (Remainders) Divide x2 + 3x + 5 by x + 1
Long Division and Synthetic Division Section 2.3 (Part 1)
Example 3 (Missing Terms) Divide 8x3 - 1 by 2x - 1.
Practice Problem 2 Divide 7x3 + 3 by x + 2
Practice Problem 3 (Division by Higher Degree Polynomials) Divide - 2 + 3x - 5x2 + 4x3 + 2x4 by x2 + 2x - 3
Synthetic Division Example 4 Divide x4 - 10x2 - 2x + 4 by x + 3
Long Division and Synthetic Division Section 2.3 (Part 1)
Practice Problem 4 Divide (3x3 - 17x2 + 15x - 25) ? (x - 5)
Remainder Theorem Synthetic division can be used to evaluate a polynomial function. To find f(k), divide f(x) by x ? k: ___________________________________________ Example 5 Given f (x) = 3x3 + 8x2 + 5x - 7 find f(-2).
Practice Problem 5 Given f (x) = 4x3 + 10x2 - 3x - 8 find f(-1).
Using Synthetic Division to Factor a Polynomial Example 6 Given f (x) = 2x4 + 7x3 - 4x2 - 27x - 18 and f (2) = 0 and f (-3) = 0 Factor f(x) completely.
Practice Problem 6
Long Division and Synthetic Division Section 2.3 (Part 1)
Given f (x) = x4 - 4x3 - 15x2 + 58x - 40 and f (5) = 0 and f (-4) = 0 factor f(x) completely.
Summary In summary, the remainder r, obtained in the synthetic division of f(x) by x ? k, provides the following information: 1. _____________________________________________________________________ 2. _____________________________________________________________________ 3. _____________________________________________________________________
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