Can this be right?

Find the equation of locus points that are one unit from (-5, 2).

my book has this answer:

Let P(x,y) represent the set of points. Using the formula for distance between two points . . .

$\displaystyle \sqrt{(x-(-5))^2+(y-2)^2}$

$\displaystyle (x+5)^2+(y-2)^2=1^2$

$\displaystyle (x+5)^2+(y-2)^2=1$

Does this compute to everyone? I don't understand how they go from $\displaystyle 1^2$ to 1 ! What am I missing?