ISEE Upper Level Math : Variables
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Example Questions
Example Question #3 : How To Subtract Variables
Simplify:
To simplify this problem we need to combine like terms.
Example Question #4 : How To Subtract Variables
Simplify:
To simplify this problem we need to combine like terms.
Example Question #5 : How To Subtract Variables
Simplify the following expression:
Simplify the following expression:
Let's begin by subtracting the 12y
From here, our answer should be apparent:
So our answer is just 0
Example Question #1 : How To Subtract Variables
Simplify the following expression:
Simplify the following expression:
We can only subtract variables with the same exponent.
In this case, we can only combine the first two terms.
To do so, keep the exponents the same and subtract the coefficients.
So our answer is:
Example Question #3 : How To Subtract Variables
Simplify the following expression:
Simplify the following expression:
Now, to complete this, we need to realize that we can only subtract variables with the same exponent.
In this case, we can only combine our first two terms, because they both have an exponent of 7. The third term has an exponent of 8, so it cannot be combined and must be left as is.
So, our answer must be:
Example Question #1 : How To Add Variables
Simplify:
Example Question #1 : How To Add Variables
Simplify:
First, rewrite the problem so that like terms are next to each other.
Next, evaluate the terms in parentheses.
Rewrite the expression in simplest form.
Example Question #3 : How To Add Variables
Simplify:
First we rewrite the problem so that like terms are together.
Next we can place like terms in parentheses and evaluate the parentheses.
Now we rewrite the equation in simplest form.
Example Question #1 : How To Add Variables
Which expression is equivalent to the expression 
The first step in simplifying this expression is to get the binomial out of the parentheses. It's important to note you cannot further simplify this binomial first, since there are no like terms in it.
Since you have a minus sign in front of the binomial, you need to flip the sign of both terms inside the parentheses to get rid of the parentheses (similar to distributing a negative one across the binomial):
Now you are able to combine like terms, making sure that exponents on the variables match exactly before you combine. The first and fourth terms are like terms, and the second and third terms are like terms.
To combine those terms, keep the variables and exponents the same and add up the coefficients. The first term has a coefficient of 
This brings you to the final, simplified answer:
Example Question #44 : Variables
Simplify:
Combine like terms:
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