book Maths Puzzle Numerical Ability

Question involvin radicals: parentheses, 6*sq.root of 2 minus 2* sq. root of 6, parentheses, everything squared.

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I need to figure out the parabola of a corner kick. The distance from the corner to the player in the field is 45 feet. The person is 5 1/2 feet tall. I am looking in my book an one side of a pool table is 1 foot longer than twice the width. the area of the pool table is 15 square feet. what is the length of the table?
how would you write this as a formula?