The graph of a sinusoidal function has a maximum point at (0,7) and then intersects its midline at (3,3).Write the formula of the function, where x is entered in radians.f(x)=
Q. The graph of a sinusoidal function has a maximum point at (0,7) and then intersects its midline at (3,3).Write the formula of the function, where x is entered in radians.f(x)=
Given Points Information: We are given a maximum point at (0,7) and a midline intersection at (3,3). The maximum point gives us the amplitude and the vertical shift, while the midline intersection gives us the horizontal shift and the period.
Calculate Amplitude: The amplitude A is the distance from the midline to the maximum point. Since the midline is at y=3 and the maximum is at y=7, the amplitude is 7−3=4.
Calculate Vertical Shift: The vertical shift D is the y-value of the midline, which is 3.
Determine Sinusoidal Function Form: The sinusoidal function will have the form f(x)=A⋅sin(B(x−C))+D or f(x)=A⋅cos(B(x−C))+D. Since the maximum point is at x=0, we will use the cosine function, which has a maximum at x=0 when there is no horizontal shift (C=0).
Find Period of Function: Now we need to find the period T of the function. The graph intersects the midline at (3,3), which is a quarter of the period after the maximum. Therefore, the full period is 4 times this value, so T=4×3=12 radians.
Calculate B Value: The value B in the function f(x)=A⋅cos(B(x−C))+D is related to the period by the formula B=T2π. So B=122π=6π.
Final Sinusoidal Function: Putting all the values together, we get the sinusoidal function: f(x)=4⋅cos(6π⋅(x−0))+3.
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