exam Maths Puzzle Numerical Ability

which point on a number line best represtents the squar root of three

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Help!

I have to solve x^2/(0.01-x) by using the quadratic formula. Ive done this problem five times and never get the answer the teacher does. What I did was 0=-x^2-x+0.01 and t if T=a+(n-1)d find t when a=16 n=11 and d=6
find t when a=20 n=6 and d=-2

please help me im stuck!!!