### All GRE Subject Test: Math Resources

## Example Questions

### Example Question #48 : Vector

What is the vector form of ?

**Possible Answers:**

**Correct answer:**

In order to derive the vector form, we must map the , , -coordinates to their corresponding , , and coefficients.

That is, given , the vector form is .

So for , we can derive the vector form .

### Example Question #49 : Vector

What is the vector form of ?

**Possible Answers:**

**Correct answer:**

In order to derive the vector form, we must map the , , -coordinates to their corresponding , , and coefficients.

That is, given , the vector form is .

So for , we can derive the vector form .

### Example Question #51 : Vectors & Spaces

Write the following parametric equation in vector form.

**Possible Answers:**

**Correct answer:**

When converting parametric equations to vector valued functions, remember that the order of vectors goes as follows.

Given the question

the vector would be given as,

.

### Example Question #51 : Vector

What is the vector form of ?

**Possible Answers:**

**Correct answer:**

In order to derive the vector form, we must map the , , -coordinates to their corresponding , , and coefficients.

That is, given , the vector form is .

So for , we can derive the vector form .

### Example Question #52 : Vector

What is the vector form of ?

**Possible Answers:**

**Correct answer:**

That is, given , the vector form is .

So for , we can derive the vector form .

### Example Question #53 : Vector

What is the vector form of ?

**Possible Answers:**

**Correct answer:**

That is, given , the vector form is .

So for , we can derive the vector form .

### Example Question #51 : Vectors & Spaces

Find the vector in standard form if the initial point is located at and the terminal point is located at .

**Possible Answers:**

**Correct answer:**

We must first find the vector in component form.

If the initial point is and the terminal point is then the component form of the vector is .

As such, the component form of the vector in the problem is

Next, any vector with component form can be written in standard form as .

Hence, the vector in standard form is

### Example Question #55 : Vector

What is the vector form of ?

**Possible Answers:**

**Correct answer:**

That is, given , the vector form is .

So for , we can derive the vector form .

### Example Question #56 : Vector

What is the vector form of ?

**Possible Answers:**

**Correct answer:**

That is, given , the vector form is .

So for , we can derive the vector form .

### Example Question #51 : Vectors & Spaces

Given points and , what is the vector form of the distance between the points?

**Possible Answers:**

**Correct answer:**

In order to derive the vector form of the distance between two points, we must find the difference between the , , and elements of the points.

That is, for any point

and ,

the distance is the vector

.

Subbing in our original points and , we get:

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