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1 vote
Write the equation in standard form for the circle with center (–8,0) and radius 2.

User Dragostis
by
7.4k points

1 Answer

2 votes
The standard equation of a circle with center
(
h
,
k
)
is
(
x

h
)
2
+
(
y

k
)
2
=
r
2
, with radius
r
.
When we have a circle centered at the origin, this equation turns into
x
2
+
y
2
=
r
2
Notice that our
(
h
,
k
)
goes away. We know that
r
=
8
, so we can plug this in. We get
x
2
+
y
2
=
8
2

x
2
+
y
2
=
64
Hope this helps!
User Seyfi
by
8.5k points

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