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The graph of a sinusoidal function intersects its midline at [tex]\((0, -7)\)[/tex] and then has a minimum point at [tex]\(\left(\frac{\pi}{4}, -9\right)\)[/tex].

Write the formula of the function, where [tex]\(x\)[/tex] is entered in radians.

[tex]\[ f(x) = \][/tex]

[tex]\(\square\)[/tex]


Sagot :

To write the formula for the given sinusoidal function [tex]\( f(x) \)[/tex], we need to determine its amplitude, frequency, and vertical shift based on the given points:

1. Vertical Shift (Midline Intersection):

The function intersects its midline at the point [tex]\((0, -7)\)[/tex], which indicates that the vertical shift [tex]\(D\)[/tex] is [tex]\( -7 \)[/tex].

2. Minimum Point:

The minimum point of the function is given at [tex]\(\left(\frac{\pi}{4}, -9\right)\)[/tex].

3. Amplitude:

The amplitude ([tex]\(A\)[/tex]) is the distance from the midline to either the maximum or the minimum value. Here, the midline value is [tex]\(-7\)[/tex] and the minimum value is [tex]\(-9\)[/tex], so the amplitude is:
[tex]\[ A = |-9 - (-7)| = | -2 | = 2 \][/tex]

4. Period and Frequency:

We know that the minimum occurs at [tex]\(\frac{\pi}{4}\)[/tex], and since this is one quarter of the period (the distance from the midline to the minimum), the full period [tex]\(T\)[/tex] can be derived as:
[tex]\[ \frac{T}{4} = \frac{\pi}{4} \implies T = \pi \][/tex]

The frequency [tex]\(B\)[/tex] is related to the period by the formula:
[tex]\[ B = \frac{2\pi}{T} = \frac{2\pi}{\pi} = 2 \][/tex]

Given these parameters:

- Amplitude [tex]\(A = 2\)[/tex]
- Frequency [tex]\(B = 2\)[/tex]
- Vertical shift (midline) [tex]\(D = -7\)[/tex]

The formula for our sinusoidal function is:
[tex]\[ f(x) = 2 \sin(2x) - 7 \][/tex]