Question text Write the function of the graph below in the form $f(x)=Asin(kx)+B$ Hint: Type pi for $\pi$ $f(x)=$ [input] Your last answer was interpreted as follows: $$ -\sin \left( 2\,\pi\,x \right)+1 $$The variables found in your answer were: $ \left[ x \right]$

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Let's parse the information we have and identify what's missing, then reason about the form f(x) = A sin(kx) + B.

First, the question asks to write the function of the graph in the form f(x) = A sin(kx) + B, with a hint to type pi for π. This means we should determine three parameters from the graph: A (the amplitude, which also controls vertical stretch and the sign indicates reflection), k (which determines the period via Period = 2π / k), and B (the vertical shift).

Second, the data provided shows there are no answer options listed (the answer array is empty). Because there are no alternative choices to analyze, we cannot evaluate each option for correctness. This absence prevents a step-by-step comparison of choices as requested.

Nevertheless, we can reason about the specific interpretation given in your message: your last answer was interpreted as [−sin(2π x) + 1], and the variables found were [x].

- If we take that interpretation literally, the function is f(x) = −sin(2πx) + 1.
  - This matches the standard form f(x) = A sin(kx) + B with A = −1, k = 2π, and B = 1.
  - The amplitude is |A| = 1 (the graph would oscillate between B − |A| and B + |A|, i.e., between 0 and 2).
  - The period is T = 2π / k = 2π / (2π) = 1, so the sine wave completes one full cycle every 1 unit along the x-axis.
  - The negative sign in front of sin indicates a reflection across the midline, so the crests/troughs are inverted relative to sin(x).

- If any of these parameters were to change, the new form would reflect those changes:
  - Changing A to a positive value would remove the reflection (e.g., A = 1 yields f(x) = sin(kx) + B).
  - Changing k while keeping A and B fixed would alter the period (T = 2π / k). The hint to type pi for π reminds us to express k in terms of π when the period is a nice rational multiple of π (e.g., k = 2π, k = π, etc.).
  - Changing B shifts the entire graph up or down by B units, altering its vertical midpoint.

- Regarding potential incorrect options in a typical set, common misconceptions include:
  - Misinterpreting the period: confusing k with a frequency-like parameter or assuming period equals the amplitude, which it does not.
  - Treating B as the amplitude or A as the vertical shift; in the standard form, A affects vertical stretch and reflection, while B shifts the graph vertically.
  - Assuming a phase shift without explicit horizontal shift parameter; the pure f(x) = A sin(kx) + B form has no phase δ. If a phase shift were present, the form would be A sin(kx + δ) + B, which is not included in the given template.

- Given the lack of answer options, the most direct way to proceed would be:
  1) Confirm from the graph the vertical midpoint (midline) of the sine wave to identify B.
  2) Determine the amplitude by measuring the vertical distance from the midline to a peak (|A|).
  3) Determine k from the observed period T: k = 2π / T. If the graph shows T = 1 unit, k would be 2π, and you would express it as f(x) = A sin(2πx) + B, adjusting A’s sign for any reflection.
  4) If the graph appears reflected across the midline, ensure A is negative; if not, A would be positive.

- Since the prompt requires analyzing options and there are none provided, we cannot enumerate incorrect choices here. If you can supply the list of answer options (the multiple-choice choices), I can walk through each one in detail, explaining why it is correct or incorrect in the same style, with varied phrasing and line breaks for readability.

- As a concrete takeaway from the provided interpretation: the function f(x) = −sin(2πx) + 1 fits the standard form with A = −1, k = 2π, B = 1, yielding a sine wave of amplitude 1, vertical shift up by 1, and period 1. If your graph matches these characteristics, that would be the correct form under the given template. If any of these characteristics differ in your graph, adjust A, k, or B accordingly and recalculate the period and midline to fit the graph.

MCD2130 - T1 - 2025 Lecture Task Week 7

Question text Write the function of the graph below in the form \(f(x)=Asin(kx)+B\) Hint: Type pi for \(\pi\) \(f(x)=\) [input] Your last answer was interpreted as follows: \[ -\sin \left( 2\,\pi\,x \right)+1 \]The variables found in your answer were: \( \left[ x \right]\)

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