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For each transformation, identify the values of \(h\) and \(k .\) Then, write the equation of the transformed function in the form \(y-k=f(x-h)\) . a) \(f(x)=\frac{1}{x},\) translated 5 units to the left and 4 units up b) \(f(x)=x^{2},\) translated 8 units to the right and 6 units up c) \(f(x)=|x|,\) translated 10 units to the right and 8 units down d) \(y=f(x),\) translated 7 units to the left and 12 units down

Short Answer

Expert verified
(a) \( y - 4 = \frac{1}{x + 5} \), (b) \( y - 6 = (x - 8)^2 \), (c) \( y + 8 = |x - 10| \), (d) \( y + 12 = f(x + 7) \)

Step by step solution

01

Identify values of h and k for part a

The function given is \(f(x)=\frac{1}{x}\). A translation of 5 units to the left means \( h = -5 \). A translation of 4 units up means \( k = 4 \).
02

Write the equation for part a

Using the values of \( h \) and \( k \), the transformed function is \( y - 4 = \frac{1}{x + 5} \).
03

Identify values of h and k for part b

The function given is \(f(x)=x^2\). A translation of 8 units to the right means \( h = 8 \). A translation of 6 units up means \( k = 6 \).
04

Write the equation for part b

Using the values of \( h \) and \( k \), the transformed function is \( y - 6 = (x - 8)^2 \).
05

Identify values of h and k for part c

The function given is \(f(x)=|x|\). A translation of 10 units to the right means \( h = 10 \). A translation of 8 units down means \( k = -8 \).
06

Write the equation for part c

Using the values of \( h \) and \( k \), the transformed function is \( y + 8 = |x - 10| \).
07

Identify values of h and k for part d

The function given is \(y=f(x)\). A translation of 7 units to the left means \( h = -7 \). A translation of 12 units down means \( k = -12 \).
08

Write the equation for part d

Using the values of \( h \) and \( k \), the transformed function is \( y + 12 = f(x + 7) \).

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Translations in the Coordinate Plane
Translations in the coordinate plane involve shifting a function's graph horizontally, vertically, or both. When we translate a function, we simultaneously slide it along the x-axis (horizontal shift) and/or the y-axis (vertical shift) without changing its shape.

For example, translating a function 5 units left and 4 units up means every point on the graph moves horizontally left by 5 units and vertically up by 4 units. This is a common task in function transformations, and once you understand how to handle these translations, solving these problems becomes straightforward.
Transformations of Functions
Transformations of functions include translations, reflections, stretches, and compressions. Translations are the most common types that involve shifting the graph of a function horizontally or vertically. Understanding transformations allows us to take a basic function like a parabola, an absolute value function, or a reciprocal function and modify its position on the graph.

To translate a function, we adjust its equation by changing the variables inside and outside the function. For example, if we have a function, say, \( f(x) \), translating it results in a new function \( y - k = f(x - h) \), where \( h \) and \( k \) are the horizontal and vertical shifts respectively. The signs of \( h \) and \( k \) indicate the direction of the shift.
Horizontal and Vertical Shifts
Horizontal and vertical shifts are specific types of translations that affect where the graph of a function appears on the coordinate plane. A horizontal shift moves the function left or right along the x-axis, while a vertical shift moves it up or down the y-axis.

Horizontal shifts are determined by the value of \( h \):
  • If \( h > 0 \), the graph shifts to the right.
  • If \( h < 0 \), the graph shifts to the left.
Similarly, vertical shifts depend on \( k \):
  • If \( k > 0 \), the graph shifts upwards.
  • If \( k < 0 \), the graph shifts downwards.
For example, translating \( f(x) = x^2 \) eight units right and six units up involves altering the equation to \( y - 6 = (x - 8)^2 \). Each translation can be analyzed separately and involves straightforward adjustments to the function's formula.

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Most popular questions from this chapter

Thomas and Sharyn discuss the order of the transformations of the graph of \(y=-3|x|\) compared to the graph of \(y=|x|\) Thomas states that the reflection must be applied first. Sharyn claims that the vertical stretch should be applied first. a) Sketch the graph of \(y=-3|x|\) by applying the reflection first. b) Sketch the graph of \(y=-3|x|\) by applying the stretch first. c) Explain your conclusions. Who is correct?

An object falling in a vacuum is affected only by the gravitational force. An equation that can model a free-falling object on Earth is \(d=-4.9 t^{2},\) where \(d\) is the distance travelled, in metres, and \(t\) is the time, in seconds. An object free falling on the moon can be modelled by the equation \(d=-1.6 t^{2}\) a) Sketch the graph of each function. b) Compare each function equation to the base function \(d=t^{2}\)

Algebraically determine the equation of the inverse of each function. a) \(f(x)=7 x\) b) \(f(x)=-3 x+4\) c) \(f(x)=\frac{x+4}{3}\) d) \(f(x)=\frac{x}{3}-5\) e) \(f(x)=5-2 x\) f) \(f(x)=\frac{1}{2}(x+6)\)

Paul is an interior house painter. He determines that the function \(n=f(A)\) gives the number of gallons, \(n,\) of paint needed to cover an area, \(A,\) in square metres. Interpret \(n=f(A)+10\) and \(n=f(A+10)\) in this context.

Michele Lake and Coral Lake, located near the Columbia Ice Fields, are the only two lakes in Alberta in which rare golden trout live. Suppose the graph represents the number of golden trout in Michelle Lake in the years since 1970. Let the function \(f(t)\) represent the number of fish in Michelle Lake since \(1970 .\) Describe an event or a situation for the fish population that would result in the following transformations of the graph. Then, use function notation to represent the transformation. a) a vertical translation of 2 units up. b) a horizontal translation of 3 units to the right.

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