Consider the function ๐‘”(๐‘ฅ)=โˆ’2cos(2๐‘ฅ+180)โˆ’1 a) State the parent function.

gildaiee

gildaiee

Answered question

2022-06-02

Consider the function ๐‘”(๐‘ฅ)=โˆ’2cos(2๐‘ฅ+180)โˆ’1 
a) State the parent function. [1T] 
b) Write the function in proper transformation form. [1T] 
c) Describe the transformations for all parameters, a, k , d and c. [4T] 
d) Create a transformation table/image table for the function and graph the function. [4A] 

d) The value for the y โ€“ intercept (use algebraic method). [1A] 
e) The value for the first 2 x โ€“ intercept(s) (use algebraic method) between 0ยฐโ‰ค๐‘ฅ โ‰ค360ยฐ [2T] 
 

Answer & Explanation

xleb123

xleb123

Skilled2023-05-19Added 181 answers

a) State the parent function. [1T]
The parent function of the given function is the cosine function, denoted by f(x)=cos(x).
b) Write the function in proper transformation form. [1T]
To write the function in proper transformation form, we need to identify and apply the necessary transformations. The general form of a cosine function with transformations is given by:
f(x)=aยทcos(k(xโˆ’d))+c
In this case, the given function is g(x)=โˆ’2cos(2x+180)โˆ’1. We can rewrite it in the proper transformation form as:
g(x)=โˆ’2cos(2(x+1802))โˆ’1
c) Describe the transformations for all parameters, a, k, d, and c. [4T]
- Amplitude (a): The amplitude of the cosine function determines the vertical stretch or compression. In this case, a=โˆ’2, which means the graph is reflected across the x-axis and vertically stretched by a factor of 2.
- Period (T) and Frequency (k): The period of the cosine function is determined by the coefficient of x inside the cosine function. In this case, k=2, which means the graph completes one full cycle in 2ฯ€2=ฯ€ units. Therefore, the period is ฯ€ units, and the frequency is 1ฯ€.
- Phase Shift (d): The phase shift of the cosine function determines the horizontal shift of the graph. In this case, d=โˆ’1802=โˆ’90, which means the graph is shifted to the right by 90 units.
- Vertical Shift (c): The vertical shift of the cosine function determines the upward or downward shift of the graph. In this case, c=โˆ’1, which means the graph is shifted downward by 1 unit.
Therefore, the transformations for all parameters are:
- The graph is reflected across the x-axis and vertically stretched by a factor of 2.
- The graph completes one full cycle in ฯ€ units, with a frequency of 1ฯ€.
- The graph is shifted to the right by 90 units.
- The graph is shifted downward by 1 unit.

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