book Maths Puzzle Numerical Ability

a local park is 30 meters long by 20 meters wide .plans are being made to double the area by adding a strip at one end and another of the same width on one side. find the width of the strips.

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Please help me solve this equation: x = 1 + the square root of 11+x. I am coming up with x= -2 and x= 5 for the solutions. The 5 works, but the -2 does not. Thank you
my answe What is the area of the circle circumscribing three circles of unit radius touching each other??