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Mon 10 Aug, 2026 05:04 am
Precalculus
Michael Sullivan
Edition 10
Chapter 1, Section 1.4
Find the center and radius of circle. Graph the circle.
Hint: Complete the square.
x^2 + y^2 + 4x + 2y - 20 = 0
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@usn0814,
x^2+4x+4+y^2+2y+1=20+5
(x+2)^2+(y+1)^2=25
(x-h)^2+(y-k)^2=r^2
The center is (-2, -1) and the radius is 5
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