GRE Subject Test: Math : Classifying Algebraic Functions

Study concepts, example questions & explanations for GRE Subject Test: Math

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Example Questions

Example Question #11 : Absolute Value Inequalities

Possible Answers:

 or 

 and

 and

There is no solution.

Correct answer:

 or 

Explanation:

At this point, you've isolated the absolute value and can solve this problems for both cases,  and .  Beginning with the first case:

 

 

Then for the second case:

Example Question #12 : Absolute Value Inequalities

Possible Answers:

or

or

 and 

Correct answer:

 and 

Explanation:

Since the absolute value with x in it is alone on one side of the inequality, you set the expression inside the absolute value equal to both the positive and negative value of the other side, 11 and -11 in this case. For the negative value -11, you must also flip the inequality from less than to a greater than. You should have two inequalities looking like this.

and

Add 5 to both sides in each inequality.

and

Divide by -4 to both sides of the inequality. Remember, dividing by a negative will flip both inequality symbols and you should have this.

and

Example Question #1 : Irrational Numbers

Evaluate: 

Possible Answers:

Correct answer:

Explanation:

We can set  in the cube of a binomial pattern:

Example Question #4 : Complex Imaginary Numbers

Simplify the following product:

Possible Answers:

Correct answer:

Explanation:

Multiply these complex numbers out in the typical way:

and recall that  by definition. Then, grouping like terms we get

which is our final answer.

Example Question #2 : Irrational Numbers

Simplify:

Possible Answers:

Correct answer:

Explanation:

Start by using FOIL. Which means to multiply the first terms together then the outer terms followed by the inner terms and lastly, the last terms.

Remember that , so .

Substitute in  for 

Example Question #11 : Number Theory

Simplify:

Possible Answers:

Correct answer:

Explanation:

Start by using FOIL. Which means to multiply the first terms together then the outer terms followed by the inner terms and lastly, the last terms.

Remember that , so .

Substitute in  for 

Example Question #12 : Number Theory

Simplify:

Possible Answers:

Correct answer:

Explanation:

Start by using FOIL. Which means to multiply the first terms together then the outer terms followed by the inner terms and lastly, the last terms.

Remember that , so .

Substitute in  for 

Example Question #1 : Equations With Complex Numbers

Solve for  and

Possible Answers:

Correct answer:

Explanation:

Remember that 

So the powers of  are cyclic. This means that when we try to figure out the value of an exponent of , we can ignore all the powers that are multiples of  because they end up multiplying the end result by , and therefore do nothing.

This means that 

Now, remembering the relationships of the exponents of , we can simplify this to:

Because the elements on the left and right have to correspond (no mixing and matching!), we get the relationships: 

No matter how you solve it, you get the values .

Example Question #61 : Algebra

Simplify: 

Possible Answers:

None of the Above

Correct answer:

Explanation:

Step 1: Split the  into .

Step 2: Recall that , so let's replace it.

We now have: .

Step 3: Simplify . To do this, we look at the number on the inside.

.

Step 4: Take the factorization of  and take out any pairs of numbers. For any pair of numbers that we find, we only take  of the numbers out.

We have a pair of , so a  is outside the radical.
We have another pair of , so one more three is put outside the radical.

We need to multiply everything that we bring outside: 

Step 5: The  goes with the 9...

Step 6: The last  after taking out pairs gets put back into a square root and is written right after the 

It will look something like this: 

Example Question #1 : Imaginary Numbers & Complex Functions

Possible Answers:

Correct answer:

Explanation:

There are two ways to simplify this problem: 

Method 1: 

Method 2: 

 

 

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