All GMAT Math Resources
Example Questions
Example Question #51 : Algebra
Which of the following is equal to ?
We'll need to remember a few logarithmic properties to answer this question:
Now we can use these same rules to rewrite the log in question:
Example Question #21 : Exponents
Simplify the following expression:
.
We start by simplifying the expression on the top. Let's add the exponents inside the parentheses and then multiply by the exponent outside of the parentheses.
Then we substract the denominator exponent form the numerator exponent:
Example Question #52 : Algebra
Simplify the following:
.
First, we need to add the exponents of the elements with the same base that are multiplied, and subtract the exponents of same-base elements that are divided:
Then
Any value raised to the power of 0 equals 1 so the final result is 1.
Example Question #31 : Understanding Exponents
. Order from least to greatest: .
This is impossible, since at least one expression is undefined.
It might be easiest to order first and work from there.
Since is a positive number less than 1, if , then . Therefore, those four expressions, from least to greatest, are
.
If , then - that is, . So changing the signs of the exponents reverses the order. As a result, the orginal four expressions, in ascending order, are
Example Question #32 : Exponents
. Order from least to greatest: .
If is negative, then:
Even powers and are positive, with and .
Since , ,
It follows that , and .
If , then - that is, . So changing the signs of the exponents reverses the order. As a result,
.
Odd powers and are negative, with and .
, so , and .
As before, changing their exponents to their opposites reverses the order:
Setting the negative numbers less than the positive numbers:
.
Example Question #31 : Understanding Exponents
. Order from least to greatest: .
Since is a positive number less than 1, if , then . Therefore,
.
Example Question #33 : Understanding Exponents
Simplify.
In order to solve this problem we have to keep in mind three properties of exponents:
The first thing we can do is take care of the negative exponent:
I included a as the exponent for in order to make the calculation easier to see.
We can now simplify by looking into each variable individually:
The last step is to put these answers together:
Example Question #34 : Understanding Exponents
Simplify.
In order to solve this problem we have to keep in mind three properties of exponents:
The first thing we can do is take care of the negative exponents:
We can now simplify by working on each variable individually:
Don't forget to simplify the coefficients as well:
We can now arrive to our answer by combining these:
Example Question #51 : Algebra
Which of the following numbers is in scientific notation?
The number in front must have an absolute value greater than or equal to 1, and less than 10. Of these choices, only qualifies.
Example Question #36 : Understanding Exponents
. Order from least to greatest: .
If , then if , . Therefore,
.