roselyndiaz29
18.03.2020 •
Mathematics
Write the standard form of the equation for the given information.
6. center (3,2) radius 6
7. center (-4,-7) radius 8
8. center (5,-9) radius 10
9. center (-8,0) diameter 14
10.center (4,5) and point on the circle (3,-7).
11. diameter with endpoints (6,4) and (10,-8)
12.center (4,9) and tangent to the x-axis
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Ответ:
Question 6
We want to find the equation of a circle with center (3,2) and radius 6.
The standard equation of a circle is given by:
where (a,b) is the center of the circle and r is the radius.
We substitute (a=3,b=2) and r=6 to get;
Simplify:
Question 7
This time the center is (a=-4,b=-7) and radius is r= 8.
We substitute into the formula:
To obtain:
We simplify to get;
Question 8
Now the center is (a=5,b=-9) radius is r=10
We substitute
To obtain;
We simplify to get:
Question 9
This circle has center (-8,0) diameter 14.
To find the radius, we divide the diameter into 2.
We substitute the center and radius into the standard equation of the circle
We simplify to obtain;
Simplify to get:
Question 10.
This time we were given: center (4,5) and point on the circle (3,-7).
We determine the radius using the distance formula:
We substitute the points to get:
We substitute the center (4,5) and radius in to the standard equation
This gives us
Simplify:
Question 11.
This time we have diameter with endpoints (6,4) and (10,-8).
The midpoint is the center of the circle.
By the midpoint rule, the center is ;
We find the radius using the distance formula:
Substitute the center (8,-2) and the point (6,4).
We substitute the center and radius into the standard equation now to get;
Simplify;
Question 12;
We were given center (4,9) and the condition that the tangent to this circle is the x-axis.
This means the radius is 9, the distance from the x-axis to the center.
We substitute the center (4,9) and radius r=9 into;
to obtain:
The required equation is
Ответ:
Attachment
Step-by-step explanation:
Given:
This is cubic equation. We will find x and y intercept.
For x-intercept: Put y=0
x-intercepts: (0,0) (1,0) (9,0)
For y-intercept: Put x=0
y-intercept: (0,0)
End behavior : It is cubic equation and leading coefficient is 1.
Leading coefficient of is positive.
So, x → ∞ , y → ∞ and x → -∞ , y → -∞
Now, we will draw the graph using points and end behavior.
Please find attachment for graph.