$\"\"$

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

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

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

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

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

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

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