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Juli2301 [7.4K]
3 years ago
13

The graph of the function showing the path of a soccer ball thrown by a goalie in a video game, f(x) = –0.05x2 + 2.5x + 5.2, is

used to determine the height of the ball depending on its distance from the goalie, x.
How do the mathematical domain and reasonable domain compare?

mathematical: 0 < x < ∞
reasonable: 0 ≤ x ≤ 25
mathematical: 0 < x < ∞
reasonable: 0 ≤ x ≤ 52
mathematical: −∞ < x < ∞
reasonable: 0 ≤ x ≤ 25
mathematical: −∞ < x < ∞
reasonable: 0 ≤ x ≤ 52

Mathematics
1 answer:
Tju [1.3M]3 years ago
6 0

Answer:

The correct option is 4.

Step-by-step explanation:

The given function is

f(x)=-0.05x^2+2.5x+5.2

Where f(x) is height of the ball and x is the distance.

It is a polynomial function with degree 2. All polynomial functions are defined for all real numbers, therefore the mathematical domain of the function is all real numbers.

-\infty

Factorize the given function.

f(x)=-0.05(x^2-50x-104)

f(x)=-0.05(x^2-50x-104)

f(x)=-0.05(x^2-52x+2x-104)

f(x)=-0.05(x(x-52)+2(x-52))

f(x) = -0.05 (x - 52) (x + 2)

Put f(x)=0 to find the x intercepts.

0 = -0.05 (x - 52) (x + 2)

Equate each factor equal to 0.

x=52,-2

Therefore at x=52 and -2, the graph of f(x) intersects x-axis. Before x=-2 and after x=52 the values of f(x) is negative. Height cannot be negative, therefore reasonable domain is lie between -2 to 52.

Distance cannot be negative, therefore the reasonable domain must be positive.

0\leq x\leq 52

Therefore the reasonable domain is 0\leq x\leq 52 and option 4 is correct.

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