A lattice point in the $xy$-plane is a point both of whose coordinates are integers (not necessarily positive).  How many lattice points lie on the hyperbola $x^2-y^2=17$?
Question:
A lattice point in the $xy$-plane is a point both of whose coordinates are integers (not necessarily positive).  How many lattice points lie on the hyperbola $x^2-y^2=17$?
Answer:
Let's think step by step.

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A lattice point in the $xy$-plane is a point both of whose coordinates are integers (not necessarily positive).  How many lattice points lie on the hyperbola $x^2-y^2=17$?
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