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Dividing Polynomials Warm Up Find all zeros for the following polynomials using factoring methods. Then provide a rough sketch of the polynomial. 1. 𝑓 𝑥 = 𝑥! + 12𝑥! − 64 2. 𝑓 𝑥 = 𝑥! + 5𝑥! − 36𝑥
Why divide? Attempt to find all the exact zeros of the following function.
𝑓 𝑥 = 𝑥! + 4𝑥! + 2𝑥 + 8 Why will we need to learn how to divide monomials?
Method 1 - Polynomial Long Division Example 1: Find the quotient: (2𝑥! − 3𝑥 − 20)÷ (2𝑥 + 5) Quotient: f(x) =
Example 2: Find the quotient: !!!!!!!!!!!
!!!
Quotient: f(x) = Method 2 - Synthetic Division Example 1: Find the quotient: (𝑥! + 2𝑥! − 5𝑥 + 16)÷ (𝑥 − 4)
Quotient: f(x) = Example 2: Find the quotient: (3𝑥! + 4𝑥! + 8)÷ (𝑥 + 2)
Quotient: f(x) =
Example 3: Find the quotient: !!!!!!!!!!!!!!!!
!!!!
Quotient: f(x) =
What’s the significance of the remainder? Determine whether (𝑥 − 5) a factor of the following:
a. 2𝑥! − 13𝑥 + 15 b. 4𝑥! − 11𝑥 − 3
DIVISION SCAVENGER HUNT: Practice! Divide the following polynomials. Rewrite the dividend as a product. State whether the divisor was a factor.