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September 22, 2014

September 22, 2014

Posted by **mwaba** on Friday, March 23, 2012 at 5:02am.

find

(i)coordinates of the centre and the radius

(ii)coordinates of the point where the circle crossesthe x-axis

- maths -
**Damon**, Friday, March 23, 2012 at 5:11amoh well

x^2 + 8 x = -y^2 + 3.5 y

x^2 + 8 x + 16 = -y^2 + 3.5 y + 16

(x+4)^2 = -y^2 + 3.5 y + 16

y^2 - 3.5 y = -(x+4)^2 + 16

y^2 - 3.5 y + 3.0625 + (x+4)^2 = 19.0625

(x+4)^2 + (y-1.75)^2 = 4.366^2

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