ehamer
x2 + y2 + 10y + 20 = 0



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zzr0ck3r
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whats the question?

ehamer
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Show that the equation represents a circle by rewriting it in standard form, and find the center and radius of the circle.

Azteck
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complete the square for y.

matricked
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x^2 +(y+5)^2= 5

Azteck
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good work matricked, no working whatsoever to show how you got that.

matricked
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centre (0,5) and radius sqrt(5)

manishsatywali
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dw:1359616706864:dw

ehamer
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THanks!
makes sense now!

manishsatywali
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compare this with equation of circle (xa)^2 + (yb)^2 = r
where a,b is the centre and r is the radius

manishsatywali
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so a = 0 y = 5 r=\[\sqrt{5}\]