Author note — to cover (Higher)

Higher page, per the A25 braces. Find nth terms an² + bn + c: halve the constant second difference for a, subtract the an² values from the sequence, then find the linear remainder's nth term; include a = 1 and a = 2 cases and pattern contexts. Cubic sequences are A level. (A25)

• Fluency — direct questions on the nth term of a quadratic sequence, limited to this lesson's stated scope (4 questions).
• Application — use the same skill in unfamiliar or contextual questions without introducing a later method (4 questions).
• Check — questions built around the exclusions and likely misconceptions named in the lesson brief (4 questions).