find the center and radius of the circle x^2 y^2 18x 4y 25=36

Algebra
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I  need help with his x2+y2+18x+4y+85=36

Apr 28th, 2015

We first separate the x terms and the y terms, then combine them into binomial form remembering to add the new constants they create.

(x+9)^2 + (y +2)^2  = 36 - 85 + 81 + 4

(x+9)^2 + (y+2)^2 = 36

Therefore, the center is (-9, -2)

The radius is sqrt(36) = 6


Apr 28th, 2015

Can you help me with another problem please? x^2+y^2-16x+18y=-141

Apr 28th, 2015

I have one more problem, I need help with x^2+y^2+18x+2y=-46

Apr 28th, 2015

(x - 8)^2 + (y+9)^2 = -141 + 64 + 81 = 4

center is (8, - 9)

radius is 2

Apr 28th, 2015

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