The shortest distance between n(a, -2) and p(1,b) can be expressed by √( (1 - a)² + (b + 2)² ) units.
Distance between two point on a plane is the length of the line segment connecting the two points. The formula to determine distance between two points, say (x₁, y₁) and (x₂, y₂) is
Distance, d = √( (x₂ - x₁)² + (y₂ - y₁)² )
Therefore in this case where the points are n(a, -2) and p(1,b), the distance between n and p is
d = √( (1 - a)² + (b - (-2))² ) units
d = √( (1 - a)² + (b + 2)² ) units
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