The given expression is a perfect square trinomial.
<h3>
How to classify the given expression?</h3>
Here we have the expression:

Notice that we can rewrite it as:

Then we can see that inside the parenthesis we have a difference of squares, but it is squared, so if we define:

We will have:

Which is in fact, a perfect square trinomial.
If you want to learn more about perfect squares:
brainly.com/question/1538726
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Answer:
155 sheets
Step-by-step explanation:
Warner used 75 of the printer paper .
He now has 80 sheets left .
Sheets in the package when warner bought it = used + remaining sheets
That’s 75 + 80
= 155
The package had 155 sheets when warner bought it .
4 are rock and 12 are pop, so 4 CD's are other