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The functions 𝑓 and 𝑔 are defined for all real numbers such that 𝑔⁡(𝑥)=𝑓⁡(2⁢(𝑥-4)). Which of the following sequences of transformations maps the graph of 𝑓 to the graph of 𝑔 in the same 𝑥⁢𝑦-plane?

Question

The functions 𝑓 and 𝑔 are defined for all real numbers such that 𝑔⁡(𝑥)=𝑓⁡(2⁢(𝑥-4)). Which of the following sequences of transformations maps the graph of 𝑓 to the graph of 𝑔 in the same 𝑥⁢𝑦-plane?

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Solution

The transformations that map the graph of 𝑓 to the 𝑔 in the same 𝑥𝑦-plane are:

  1. Horizontal scaling by a factor of 1/2: This is because the argument of the function 𝑓 in 𝑔(𝑥) is 2(𝑥-4), not just 𝑥. The factor of 2 inside the parentheses means that the graph of 𝑓 is compressed horizontally by a factor of 1/2 to get the graph of 𝑔.

  2. Horizontal translation 4 units to the right: This is because of the "-4" inside the parentheses in 2(𝑥-4). This means that the graph of 𝑓, after being scaled, is then shifted 4 units to the right to get the graph of 𝑔.

So, the sequence of transformations is: horizontal scaling by a factor of 1/2, then horizontal translation 4 units to the right.

This problem has been solved

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