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(1) Consider each quadrant separately or use a symmetry argument.
(2) Write $2^{1/n} = 1 + \delta$ and use the Binomial Theorem.
(3) Consider the symmetry of the graph and the point at which it cuts the line $y=x$.
(4) Use the result of (3) and a symmetry argument.
(5) Consider each quadrant separately.
Squareness
Age 16 to 18
Challenge Level 
(1) Consider each quadrant separately or use a symmetry argument.
(2) Write $2^{1/n} = 1 + \delta$ and use the Binomial Theorem.
(3) Consider the symmetry of the graph and the point at which it cuts the line $y=x$.
(4) Use the result of (3) and a symmetry argument.
(5) Consider each quadrant separately.
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