Quadratic Functions in Algebra
posted by Jared .
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:

x^2  6 x = C20
x^2  6 x + 9 = C  11
(x3)^2 = C9
vertex at x = 3,000 and cost = 900