SOLUTION: Find the radius of the circle. {{{x^2 + y^2 + 4x - 16y + 19 = 0}}}

SOLUTION: Find the radius of the circle. {{{x^2 + y^2 + 4x - 16y + 19 = 0}}}

Algebra.Com

Question 876478: Find the radius of the circle.

Answer by ewatrrr(24785) (Show Source): You can put this solution on YOUR website!
Need to Know: Completing Square
(x+2)^2 + (y-8)^2 = -19 + 4 + 64 = 49
(x+2)^2 + (y-8)^2 = 49 (which is r^2)
r = 7
(positive root only for unit measure)
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