$\"\"$ \ \

The value of $\"\"$ and $\"\"$ .

The magnitude of a vector is $\"\"$ is $\"\"$ .

$\"\"$ .

$\"\"$

The vector represented by $\"\"$ has length $\"\"$ .

$\"\"$

Squaring on both sides.

$\"\"$

Apply zero product property.

$\"\"$

The values of $\"\"$ are $\"\"$ .