### All Precalculus Resources

## Example Questions

### Example Question #1 : Find The Product Of A Vector And A Scalar

Find the product of the vector and scalar .

**Possible Answers:**

**Correct answer:**

When multiplying a vector by a scalar we multiply each component of the vector by the scalar and the result is a vector:

### Example Question #2 : Find The Product Of A Vector And A Scalar

Find the vector given by the product:

**Possible Answers:**

**Correct answer:**

Given a scalar k and a vector v, the vector given by their products is defined component-wise:

.

Here, our product is:

### Example Question #3 : Find The Product Of A Vector And A Scalar

This question refers to the previous question.

Simplify.

**Possible Answers:**

**Correct answer:**

In order to simplify this problem we need to multiply the scalar factor to each component of the vector.

In our case the scalar factor is

Thus,

### Example Question #4 : Find The Product Of A Vector And A Scalar

Evaluate:

**Possible Answers:**

**Correct answer:**

In order to determine the final value of the vector, distribute the scalar among each term in the vector.

### Example Question #5 : Find The Product Of A Vector And A Scalar

If the vector from to was multiplied by a scale factor of 3, what is the new vector ?

**Possible Answers:**

**Correct answer:**

To find :

Subtract vector from .

Multiply this vector by a scale of 3.

### Example Question #6 : Find The Product Of A Vector And A Scalar

Find the product of:

**Possible Answers:**

**Correct answer:**

When a scalar is multiplied to a vector, simply distribute that value for both terms in the vector.

### Example Question #7 : Find The Product Of A Vector And A Scalar

When given a vector and a scalar what happens to the length and angle of when multiplied with ?

**Possible Answers:**

or the length of the product is the same as the original vector.

The angle is unchanged

or the length of the product is times as long as the original vector.

The angle is multiplied by .

or the length of the product is times the length of the original vector.

The angle is multiplied by

or the length of the product is the same as the original vector.

The angle is multiplied by .

or the length of the product is times the length of the original vector.

The angle is unchanged.

**Correct answer:**

or the length of the product is times the length of the original vector.

The angle is unchanged.

In simple terms is the hypotenuse of a triangle formed by the components of . So when you multiply by it mupltiplies all the componets by . This makes the length of the hypotensuse grow by as demonstrated by from the Pythagorean Theorem.

For the same reasons the angle does not change because the new longer triangle will be a similar triangle to the original triangle.

### Example Question #8 : Find The Product Of A Vector And A Scalar

Determine the product:

**Possible Answers:**

**Correct answer:**

To find the product of the scalar and the vector, simply multiply the scalar throughout each term inside the vector. Do not confuse this with the dot product or the norm of a vector.

The answer is: