### All Precalculus Resources

## Example Questions

### Example Question #1 : Find The Unit Vector In The Same Direction As A Given Vector

Find the unit vector that is in the same direction as the vector

**Possible Answers:**

**Correct answer:**

To find the unit vector in the same direction as a vector, we divide it by its magnitude.

The magnitude of is .

We divide vector by its magnitude to get the unit vector :

or

All unit vectors have a magnitude of , so to verify we are correct:

### Example Question #2 : Find The Unit Vector In The Same Direction As A Given Vector

A unit vector has length .

Given the vector

find the unit vector in the same direction.

**Possible Answers:**

**Correct answer:**

First, you must find the length of the vector. This is given by the equation:

Then, dividing the vector by its length gives the unit vector in the same direction.

### Example Question #1 : Find The Unit Vector In The Same Direction As A Given Vector

Put the vector in unit vector form.

**Possible Answers:**

**Correct answer:**

To get the unit vector that is in the same direction as the original vector , we divide the vector by the magnitude of the vector.

For , the magnitude is:

.

This means the unit vector in the same direction of is,

.

### Example Question #1 : Find The Unit Vector In The Same Direction As A Given Vector

Find the unit vector of

.

**Possible Answers:**

**Correct answer:**

In order to find the unit vector **u** of a given vector **v**, we follow the formula

Let

The magnitude of v follows the formula

.

For this vector in the problem

.

Following the unit vector formula and substituting for the vector and magnitude

.

As such,

.

### Example Question #1 : Find The Unit Vector In The Same Direction As A Given Vector

Find the unit vector of

**Possible Answers:**

**Correct answer:**

In order to find the unit vector **u** of a given vector **v**, we follow the formula

Let

The magnitude of v follows the formula

For this vector in the problem

Following the unit vector formula and substituting for the vector and magnitude

As such,

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