Homework Help: precal

Posted by laura on Friday, April 13, 2012 at 9:45am.

A cell phone company’s profit is modeled by the function p(x) = 10x − x2 − 1, where p is expressed in thousands of dollars and x is the number of phones sold in hundreds. How many phones must the company sell to make a profit of more than $15,000?

precal - Henry, Saturday, April 14, 2012 at 10:36am
P(x) = 10x - x^2 - 1 = 15.
-x^2 + 10x - 1 - 15 = 0.
-x^2 + 10x - 16 = 0.
Solve using Quadratic Formula and get:
X = 2 = 200 Phones.
X = 8 = 800 Phnes.

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