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September 23, 2014

September 23, 2014

Posted by **lindsay** on Sunday, April 29, 2012 at 12:25am.

a. x^2 + 2root7x +7 + (Y-root 11)^2 =11

b. x^2 -12x + 84 =-y^2 + 16y

- geometry -
**Henry**, Monday, April 30, 2012 at 5:04pma. Clarify Eq.

b. x^2-12x=84 -y^2+16y.

x^2-12x+(-12/2)^2+y^2-16y+(-16/2)^2 = -84+36+64.

x^2-12x+36+y^2-16y+(-16/2)^2 = -84.

x^2-12x+36+y^2-16y+64 = -84+36+64.

(x-6)^2+(y-8)^2 = 16.

C(6.8).

r^2 = 16.

r = 4.

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