a.
To graph: The coordinate axes in the construction window.
Given information:
Two the name of axis x & y .
Graph:
Interpretation:
Draw/display the coordinate axes (Graph >> Define
b.
To graph: The line y=−1 as the directrix and the point (0,1) as the focus.
Given information:
Line y=−1 .
The point (0,1) .
Graph:
Interpretation:
Plot point (0,1) which named F and the line y=−1 .
c.
To graph: The horizontal lines and concentric circle.
Given information:
Horizontal line.
Concentric circle.
Graph:
Interpretation:
The center of the concentric circles is (0,1) or point F in our case.
The Snap Points feature will be helpful in constructing the concentric circles and the horizontal lines as shown
d.
To graph: The points where these horizontal lines and concentric circles meet.
Given information:
Construct the points where these horizontal lines and concentric circles meet.
Graph:
Interpretation:
Construct the points where these horizontal lines and concentric circles meet .
e.
To prove: The points lie on the parabola with directrix y=−1 and focus (0,1) .
Given information:
The point which is needed to be verified if it lies on the parabola with directrix y=−1 and focus (0,1) .
Proof:
A parabola with directrix y=−1 and focus at (0,1) has equation x2=4y . Since P is on the circle x2+(y−1)2=n2 and on the line y=n−1 , its x -coordinate of P must be
x=√n2−((n−1)−1)2=√n2−(n−2)2
Substituting (√n2−(n−2)2,n−1) into x2=4y shows that (√n2−(n−2)2)2=4(n−1) where P lies on the parabola x2=4y
Chapter 8 Solutions
PRECALCULUS:GRAPHICAL,...-NASTA ED.
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