Answer:
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Step-by-step explanation:
Answer:
The equation of circle A with radius AC is , or in other words option d.
Step-by-step explanation:
If the radius of this circle is AC, then we can determine the distance between points A ( - 1, 4 ) and C ( - 5,1 ) to come to the length of the radius -
Distance between A and C =
=
= = = 5 units - Which is also the length of the radius of the circle.
So if the radius is given to be 5 in length, knowing that the general equation for a circle is ( where ( h, k ) is the center and r is the radius ) if the radius is 5, , and solution must be option b / option d.
Now if the radius is AC, the center point must be point A ( circle A ). Therefore point ( - 1, 4 ) is the center, and the equation of the circle must be the following -
= - and hence our solution is option d
Answer:
Step-by-step explanation:
Given
Required
What can replace ?
We have:
and
Add up both equations:
<em>Since </em><em> is a result of </em><em> and </em><em>,</em>
<em></em><em> can replace </em><em></em>
X=(-b/2a)
that is the answer