Answer:
4.
6.
8.
Explanation:
4. For this problem, there are only like terms, so we don't need to worry about that. In this case, all we need to do is subtract the coefficients of h. This means that
6. In this problem, there are two different sets of terms. X's and constants. This means that we need to add these two sets separately.
Let us start with the X's. We have
To subtract these two terms, we have to find a common denominator. In this case, we can choose 20.
To get a denominator of 5 to become 20, we need to multiply it by 4. This means that we need to multiply both the top and the bottom of the fraction by 4.
This gives us
The second portion is
which is
Now that we have combined each term, we can add these two different terms together.
8. We begin with the expression:
Before we can combine like terms, we need to remove the parenthesis. To do this, we can multiply each term inside by
This gives us
These fractions simplify to
Lastly, we can combine the like terms of -1 and -17 to get -18.
This gives us the final expression of :