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What is the amplitude of the function (6-2\sin 4x)?

Answer and explanation

Correct answer: (2)

The direct answer is option C, 2. In a function of the form y=D+A sin(Bx), the amplitude is the absolute value |A|. It measures the maximum distance of the graph from its middle line y=D. Here y=6-2 sin 4x, so the middle line is y=6 and the sine coefficient is A=-2. Thus the amplitude is |-2|=2. Since -1≤sin 4x≤1, the function ranges from 6-2(1)=4 to 6-2(-1)=8; its midpoint is 6 and its distance to either extreme is 2. Option A, 6, is the vertical shift or midline, not amplitude. Option B, 4, is the lower extreme value, not amplitude. Option C works. Option D, 8, is the upper extreme value, not amplitude. The number 4 inside the sine affects period, not amplitude. Memory cue: amplitude is the absolute coefficient of sine or cosine.

Related tags

AmplitudeSineTransformation

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