### All GRE Subject Test: Math Resources

## Example Questions

### Example Question #125 : Algebra

Rewrite the following expression as a single logarithm

**Possible Answers:**

**Correct answer:**

Recall a few properties of logarithms:

1.When adding logarithms of like base, we multiply the inside.

2.When subtracting logarithms of like base, we divide the inside.

3. When multiplying a logarithm by a number, we can raise the inside to that power.

So we begin with this:

I would start with 3 to simplify the first log.

Next, use rule 1 on the first two logs.

Then, use rule 2 to combine these two.

So our answer is 6.06.

### Example Question #126 : Algebra

**Possible Answers:**

**Correct answer:**

When combining logarithms into one log, we must remember that addition and multiplication are linked and subtraction and division are linked.

In this case we have multiplication and division - so we assume anything that is negative, must be placed in the bottom of the fraction.

### Example Question #127 : Algebra

**Possible Answers:**

**Correct answer:**

When rewriting an exponential function as a log, we must follow the model below:

A log is used to find an exponent. The above corresponds to the exponential form below:

### Example Question #128 : Algebra

**Possible Answers:**

**Correct answer:**

In order to rewrite a log, we must remember the pattern that they follow below:

In this question we have:

### Example Question #129 : Algebra

Express as a single logarithm.

**Possible Answers:**

**Correct answer:**

Step 1: Recall all logarithm rules:

Step 2: Rewrite the first term in the expression..

Step 3: Re-write the third term in the expression..

Step 4: Add up the positive terms...

Step 5: Subtract the answer the other term from the answer in Step 4.

### Example Question #130 : Algebra

**Possible Answers:**

**Correct answer:**

In order to expand this log, we must remember the log rules.

### Example Question #12 : Logarithms

**Possible Answers:**

**Correct answer:**

### Example Question #13 : Logarithms

**Possible Answers:**

**Correct answer:**

### Example Question #14 : Logarithms

Rewrite the following expression as a single logarithm

**Possible Answers:**

**Correct answer:**

Recall a few properties of logarithms:

1.When adding logarithms of like base, we multiply the inside.

2.When subtracting logarithms of like base, we divide the inside.

3. When multiplying a logarithm by a number, we can raise the inside to that power.

So we begin with this:

I would start with 3 to simplify the first log.

Next, use rule 1 on the first two logs.

Then, use rule 2 to combine these two.

So our answer is 6.06.