Table of contents
- 0. Review of Algebra4h 16m
- 1. Equations & Inequalities3h 18m
- 2. Graphs of Equations43m
- 3. Functions2h 17m
- 4. Polynomial Functions1h 44m
- 5. Rational Functions1h 23m
- 6. Exponential & Logarithmic Functions2h 28m
- 7. Systems of Equations & Matrices4h 6m
- 8. Conic Sections2h 23m
- 9. Sequences, Series, & Induction1h 19m
- 10. Combinatorics & Probability1h 45m
4. Polynomial Functions
Quadratic Functions
4:29 minutes
Problem 7f
Textbook Question
Textbook QuestionSolve each problem. During the course of ayear, the number of volunteers available to run a food bank each month is modeled by V(x), where V(x)=2x^2-32x+150 between the months of January and August. Here x is time in months, with x=1 representing January. From August to December, V(x) is mod-eled by V(x)=31x-226. Find the number of volunteers in each of the following months. August
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Key Concepts
Here are the essential concepts you must grasp in order to answer the question correctly.
Quadratic Functions
A quadratic function is a polynomial function of degree two, typically expressed in the form V(x) = ax^2 + bx + c. In this case, V(x) = 2x^2 - 32x + 150 represents the number of volunteers from January to August. Understanding how to evaluate quadratic functions is essential for determining the number of volunteers in specific months.
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Piecewise Functions
Piecewise functions are defined by different expressions based on the input value. In this problem, V(x) is defined by two different equations: one for January to August and another for August to December. Recognizing how to work with piecewise functions is crucial for correctly applying the appropriate formula based on the month in question.
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Function Composition
Function Evaluation
Function evaluation involves substituting a specific input value into a function to find the corresponding output. To find the number of volunteers in August, we need to evaluate V(x) at x = 8 using the quadratic function. This process is fundamental in algebra, as it allows us to derive specific values from general mathematical expressions.
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