Question

A circle is drawn on a coordinate plane with the center point at (−2,0)
and a radius of 7. Derive the equation of the circle in standard form, using the given information and the Pythagorean Theorem.(1 point)
Responses

(x+2)2+y2=49
left parenthesis x plus 2 right parenthesis squared plus y squared equals 49

x2+(y+2)2=49
x squared plus left parenthesis y plus 2 right parenthesis squared equals 49

(x−2)2+y2=49
left parenthesis x minus 2 right parenthesis squared plus y squared equals 49

x2+(y−2)2=49

Answer 1

To derive the equation of a circle in standard form, we use the formula:

\[
(x - h)^2 + (y - k)^2 = r^2
\]

where \((h, k)\) is the center of the circle and \(r\) is the radius.

Given:
- Center \((h, k) = (-2, 0)\)
- Radius \(r = 7\)

Substituting these values into the formula:

1. Substitute \(h = -2\) and \(k = 0\):
\[
(x - (-2))^2 + (y - 0)^2 = 7^2
\]
This simplifies to:
\[
(x + 2)^2 + y^2 = 49
\]

Therefore, the equation of the circle in standard form is:

\[
(x + 2)^2 + y^2 = 49
\]

So the correct response is:
\[
\text{(x+2) }^2 + y^2 = 49
\]