Answered

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What is the equation of the circle?
A.
( ) ( )
2 2
x y + + + = 2 1 25
B.
( ) ( )
2 2
x y − + − = 2 1 25
C.
( ) ( )
2 2
x y − + − = 2 1 5
D.
( ) ( )
2 2
x y + + + = 2 1 5


Sagot :

Answer:

We know that the general equation for a circle is ( x - h )^2 + ( y - k )^2 = r^2, where ( h, k ) is the center and r is the radius. So add 21 to both sides to get the constant term to the righthand side of the equation. Then complete the square for the y terms.