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The function [tex]$y=-2(x-2)^2+6$[/tex] shows the daily profit (in hundreds of dollars) of a hot dog stand, where [tex]$x$[/tex] is the price of a hot dog (in dollars). Find and interpret the zeros of this function.

Select two answers: one for the zeros and one for the interpretation.

A. Zeros at [tex]$x=2 \pm \sqrt{3}$[/tex]

B. Zeros at [tex][tex]$x=2$[/tex][/tex] and [tex]$x=6$[/tex]

C. The zeros are the hot dog prices at which they sell 0 hot dogs.

D. The zeros are the hot dog prices that give [tex][tex]$\$[/tex]0.00$[/tex] profit (no profit).


Sagot :

To find the zeros of the function [tex]\( y = -2(x-2)^2 + 6 \)[/tex] which represents the daily profit of a hot dog stand in terms of the price [tex]\( x \)[/tex] of a hot dog, we need to solve for [tex]\( x \)[/tex] when [tex]\( y = 0 \)[/tex].

### Step-by-Step Solution

1. Set the function equal to zero:
[tex]\[ -2(x-2)^2 + 6 = 0 \][/tex]

2. Isolate the quadratic term:
[tex]\[ -2(x-2)^2 = -6 \][/tex]

Divide both sides by [tex]\(-2\)[/tex]:
[tex]\[ (x-2)^2 = 3 \][/tex]

3. Solve for [tex]\( x \)[/tex] by taking the square root of both sides:
[tex]\[ x - 2 = \pm \sqrt{3} \][/tex]

4. Solve for [tex]\( x \)[/tex]:
[tex]\[ x = 2 \pm \sqrt{3} \][/tex]

So, the zeros of the function are [tex]\( x = 2 - \sqrt{3} \)[/tex] and [tex]\( x = 2 + \sqrt{3} \)[/tex].

The interpretation of these zeros is that they represent the hot dog prices at which the profit is exactly \[tex]$0.00 (no profit). ### Answers - For the zeros: \( x = 2 \pm \sqrt{3} \). Correct answer is A. - For the interpretation: The zeros are the hot dog prices that give $[/tex]\[tex]$ 0.00$[/tex] profit (no profit).
Correct answer is D.