exam Maths Puzzle Numerical Ability

Find the length x. Express your answer in simplified radical form.
x x
51ft x x
x x X
x x
x x
xxxxxxxxxxxx
45ft

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exam Other Question
(x^2-2x+1)^2+(x^2-2x+1)-12=0 Factor completely: x^3+x^2+y^3-y^2