exam Maths Puzzle Numerical Ability

Please help me.

Solve by completing the square.
2x^2+10x+11=0

I get-5+-sqrt23/2

not sure how I got there. Is it right? How should I work it out.

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The width of a tennis court is 12yd. How many feet is that? Ellie is 33 years old. This is three times as old as Sophie was when Ellie was as old as Sophie is now."
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