book Maths Puzzle Numerical Ability

How do I complete the square of x^2-x-20=0 to the nearest hundredth?

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book Other Question

I am trying to convert 3.15E4 kilometers per second to parsecs per year. I do not know what formula to use - Your advice would be greatly appreciated. solve using the quadreatic formula
9d^2-81=0

Solve by any method
1) x^2+25=10x
2) 10h-2=11h^2

solve by any method.
1) -2x+10=0
2x-2y=6

2) y=-x-2
y=-3x+4

3