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Quadratic Functions in Algebra

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Suppose C(x)=x^2−6x+20 represents the costs, in hundreds, to produce x thousand pens. How many pens should be produced to minimize the cost? What is the minimum cost?

Number of pens to minimize cost:

Minimum Cost:

  • Quadratic Functions in Algebra -

    x^2 - 6 x = C-20

    x^2 - 6 x + 9 = C - 11

    (x-3)^2 = C-9

    vertex at x = 3,000 and cost = 900

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