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25 December, 12:07

John is selling candy bars the equation is p=c^2+2c-5 determines the profit, p, where c is the number of candy bars sold what is the minimum number of candy bars he needs to sell to make profit

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  1. 25 December, 12:32
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    Step-by-step explanation:

    Find the value of c where p = 0.

    0 = c² + 2c - 5

    6 = c² + 2c + 1

    6 = (c + 1) ²

    ±√6 = c + 1

    c = - 1 ± √6

    c must be positive, so c = - 1 + √6 ≈ 1.45. So John must sell at least 2 candy bars to make a profit.

    We can also show this using trial and error.

    If c = 0, then p = - 5

    If c = 1, then p = - 2

    If c = 2, then p = 3
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