Determine the different possibilities for the numbers of positive, negative, and nonreal complex zeros of each function.
Table of contents
- 0. Review of Algebra4h 18m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations1h 43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 5m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 22m
- 10. Combinatorics & Probability1h 45m
4. Polynomial Functions
Zeros of Polynomial Functions
Problem 1
Textbook Question
Determine whether each statement is true or false. If false, explain why. Because x-1 is a factor of ƒ(x)=x6-x4+2x2-2, we can also conclude that ƒ(1) = 0.
Verified step by step guidance1
Recall the Factor Theorem, which states that if \( x - a \) is a factor of a polynomial \( f(x) \), then \( f(a) = 0 \).
Identify the value of \( a \) from the factor \( x - 1 \). Here, \( a = 1 \).
Evaluate the polynomial \( f(x) = x^6 - x^4 + 2x^2 - 2 \) at \( x = 1 \) by substituting 1 into the polynomial: \( f(1) = 1^6 - 1^4 + 2(1)^2 - 2 \).
Simplify the expression \( f(1) \) step-by-step to check if it equals zero.
If \( f(1) = 0 \), then \( x - 1 \) is a factor and the statement is true; if not, the statement is false because the Factor Theorem requires \( f(1) = 0 \) for \( x - 1 \) to be a factor.
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Factor Theorem
The Factor Theorem states that a polynomial f(x) has (x - c) as a factor if and only if f(c) = 0. This means that if x - 1 is a factor of f(x), then substituting x = 1 into f(x) should yield zero.
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Evaluating Polynomials
Evaluating a polynomial at a specific value involves substituting that value for the variable and simplifying. This process helps determine if the polynomial equals zero at that point, which is essential for applying the Factor Theorem.
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Introduction to Polynomials
True/False Reasoning in Algebra
Determining the truth of a statement in algebra requires verifying conditions precisely. If a statement claims a factor implies a certain value of the polynomial, checking the polynomial's value at that point confirms or refutes the claim.
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