A company's profit P in thousands of dollars can be modeled ...

Question Analysis
This question requires students to apply the quadratic formula to a business context, specifically finding the break-even point.

Key Concept Explanation
The key concept here is the application of the quadratic formula to solve for the roots of a quadratic equation, which in this case represents the number of units sold that result in zero profit.

Step-by-step Solution
1. Set the profit equation to zero: .
2. Identify the coefficients: , , .
3. Substitute into the quadratic formula: .
4. Simplify the expression under the square root: .
5. Further simplify:

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Algebra-1

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