Answer
$3x^3+x-4$
Work Step by Step
A square has four sides of the same length.
Perimeter $\div$ 4 = Side length
$\frac{12x^3+4x-16}{4}=3x^3+x-4$
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.