AT is a tangent at T to a circle, centre O.

OT = x cm AT = (x+5) cm OA = (x+8) cm

a) Show that x^2-6x-39=0

b) Solve the equation x^2-6x-39=0 to find the radius of the circle

Give your answer correct to 3 significant figures.

Someone please help.

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- November 12th 2008, 09:36 AMalicequadratic equations?
AT is a tangent at T to a circle, centre O.

OT = x cm AT = (x+5) cm OA = (x+8) cm

a) Show that x^2-6x-39=0

b) Solve the equation x^2-6x-39=0 to find the radius of the circle

Give your answer correct to 3 significant figures.

Someone please help. - November 12th 2008, 10:02 AMmasters