Answer
$x^4+2x^2-6$ meters each
Work Step by Step
Divide the length by 3 to have:
$=\dfrac{3x^4+6x^2-18}{3}
\\=x^4+2x^2-6$
Therefore, the length of each piece is $x^4+2x^2-6$ meters.
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.