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𝘶-substitution: defining 𝘶

AP.CALC: FUN‑6 (EU), FUN‑6.D (LO), FUN‑6.D.1 (EK)

Problem

Chioma was asked to find integral, left parenthesis, 18, x, squared, plus, 3, right parenthesis, left parenthesis, 6, x, cubed, plus, 3, x, right parenthesis, start superscript, 6, end superscript, d, x using u-substitution.
How should Chioma define u?
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