
Concept explainers
a.
To find: The variation caused by the equation (y−2)2=8x in the original equation y2=8x .
a.

Answer to Problem 155RE
The original graph is shifted upward by 2 units.
Explanation of Solution
Given:
The original equation y2=8x and variation (y−2)2=8x .
Calculation:
Recall that the subtracting a number from y-value shift the graph upward. So, the equation (y−2)2=8x shifts the graph of the original equation upward by 2 units.
b.
To find: The variation caused by the equation y2=8(x+1) in the original equation y2=8x .
b.

Answer to Problem 155RE
y2=8(x+1) shifts the graph of the original equation to left by 1 unit.
Explanation of Solution
Given:
The original equation y2=8x and variation y2=8(x+1) .
Calculation:
Recall that adding a positive number to x-value will shift the graph of the original function left by that unit.
So, the equation y2=8(x+1) shifts the graph of the original equation to left by 1 unit.
c.
To find: The variation caused by the equation y2=−8x in the original equation y2=8x .
c.

Answer to Problem 155RE
The equation y2=−8x reflect the graph of the original equation about y-axis.
Explanation of Solution
Given:
The original equation y2=8x and variation y2=−8x .
Calculation:
The equation y2=−8x can be seen as y2=8(−x) . That means, each x-value is being reflected about the y-axis.
So, the equation y2=−8x reflect the graph of the original equation about y-axis.
d.
To find: The variation caused by the equation y2=4x in the original equation y2=8x .
d.

Answer to Problem 155RE
The equation y2=4x stretches the graph of the original function by 2 units.
Explanation of Solution
Given:
The original equation y2=8x and variation y2=4x .
Calculation:
The equation y2=4x can be seen as y2=8(12x) . That means, each x-value is being divided by 2 which makes the graph of the original function to stretch vertically.
So, the equation y2=4x stretches the graph of the original function by 2 units.
Chapter 9 Solutions
Precalculus with Limits: A Graphing Approach
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