exam Maths Puzzle Numerical Ability

Prove that ((AC)^2/(BC)^2)=(AD/BD) In right triangle ACB (C is the right angle) with CD as an altitude (D is between A and B)

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How do I finish this? x^2+8x-3=0
x^2+8x=3
x^2+8x+64/4=3/1+64/4=12/4+64/4=76/4
x^2+8x+64/4=76/4
(x+8/2)^2=76/4
x+8/2=+ or - the square root of 76/4........

I got stuck right here. Find one set of polar coordinates for the point given in rectangular coordinates. The equation is (2,-3).