You may want to review simplifying roots first.

You can find the distance between any two points. You take the
difference between the two *x*-coordinates (in either order)
and square it. Then you take the difference between the
two *y*-coordinates and square it. You add the two squares
and take the *square root* of the answer.

For example, suppose the points are (−2, 0) and (0, 0).
Then the *x*-coordinates are −2 and 0, so the
difference is 2 (or −2, if you subtract in the other order).
When you square that, you get 4. The *y*-coordinates are both
0, so their difference is also 0, whose square is still 0. Adding
the two squares gives 4 + 0 = 4. Then you take the square root of
4, which gives the answer, 2.

The answer won't always be a whole number. For example, suppose
we had to find the distance between (−3, 0) and (0,
−1). Then the difference between the *x*-coordinates
is 3, whose square is 9. The difference between
the *y*-coordinates is 1, whose square is 1. Adding the two
squares gives 9 + 1 = 10. Then the answer is √10. Don't
forget to take the square root at the end, and to simplify it if
possible!