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
3:01 minutes
Problem 7d
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. October
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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 models the number of volunteers from January to August. Understanding how to evaluate quadratic functions is essential for determining the number of volunteers during these months.
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Piecewise Functions
A piecewise function is defined by different expressions based on the input value. In this scenario, V(x) has two distinct expressions: one for January to August and another for August to December. Recognizing how to apply the correct function based on the month is crucial for accurately calculating the number of volunteers in October.
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Function Evaluation
Function evaluation involves substituting a specific input value into a function to find the corresponding output. For October, which corresponds to x=10, we need to use the second piece of the piecewise function, V(x) = 31x - 226. Mastering function evaluation allows us to determine the exact number of volunteers available in that month.
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