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.
Last edited by alice; Nov 12th 2008 at 09:08 AM.
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Originally Posted by alice 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 I think you probably meant to say: Show that Originally Posted by alice b) Solve the equation x^2-6x-39=0 to find the radius of the circle Give your answer correct to 3 significant figures. The quadratic will not factor, so use the quadratic formula to solve. Use only the positive root and round to 3 sig digits. I got
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