Answer
a difference of squares
Work Step by Step
Both terms in the given expression, $
n^4-81
,$ are perfect squares and their coefficients have opposite signs. Hence, the given expression is $\text{
a difference of squares
}.$
You can help us out by revising, improving and updating this answer.
Update this answerAfter you claim an answer you’ll have 24 hours to send in a draft. An editor will review the submission and either publish your submission or provide feedback.