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​The function 𝑓 is defined by 𝑓⁡(𝑥)=𝑎⁢sin⁡(𝑏⁢(𝑥+𝑐)+𝑑), for constants 𝑎, 𝑏, 𝑐, and 𝑑. In the 𝑥⁢𝑦-plane, the points (2,2) and (4,4) represent a minimum value and a maximum value, respectively, on the graph of 𝑓. What are the values of 𝑎 and 𝑑 ?

Question

​The function 𝑓 is defined by 𝑓⁡(𝑥)=𝑎⁢sin⁡(𝑏⁢(𝑥+𝑐)+𝑑), for constants 𝑎, 𝑏, 𝑐, and 𝑑. In the 𝑥⁢𝑦-plane, the points (2,2) and (4,4) represent a minimum value and a maximum value, respectively, on the graph of 𝑓. What are the values of 𝑎 and 𝑑 ?

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Solution

The function f(x) = asin(b(x+c)+d) is a sinusoidal function. The amplitude of this function is given by the absolute value of a, and the vertical shift of the function is given by d.

Given that (2,2) and (4,4) represent a minimum and a maximum value respectively, we can infer that the function oscillates between these two y-values.

The amplitude of the function is half the distance between the maximum and minimum y-values. So, a = (4 - 2) / 2 = 1.

The vertical shift, d, is the average of the maximum and minimum y-values. So, d = (4 + 2) / 2 = 3.

Therefore, a = 1 and d = 3.

This problem has been solved

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