$\"\"$

The points are C $\"\"$ and D $\"\"$ .

The distance between two points $\"\"$ is $\"d$ .

$\"\"$ (Substitute $\"\"$ )

$\"\"$ (Subtract: $\"\"$ )

$\"\"$ (Evaluate powers: $\"\"$ )

$\"\"$ (Add: $\"\"$ ) $\"\"$

The distance between two points C and D is $\"\"$ units.