Question

The owner of a computer store estimates profits using

the equation P = 4x² - 15x - 20 where P is the profit, in
dollars, and x is the number of
computers sold.
What is the estimated profit when 60 computers are
sold?
$26,400
$15,320
O $14,400
$13,520
$13,480

Answer 1

(e) $13,480

Explanation:

You want the estimated profit from selling 60 computers, if the profit from selling x computers is P = 4x² -15x -20.

Profit

Put 60 where x is in the profit equation and do the arithmetic.

The result is an estimated profit of $13,480.

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Additional comment

To simplify evaluation, the polynomial can be written in "Horner form:"

P = (4x -15)x -20

Evaluating it this way takes fewer math operations and generally involves smaller numbers.

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