exam Maths Puzzle Numerical Ability

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.

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The supplemet of an angle measures 10 times more than the measure of its complement. What is the measure of the angle? 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)