Author note — to cover (Higher)

Higher page, per the A18 braces on quadratics requiring rearrangement. Collect every term onto one side equal to zero before factorising, e.g. x² = x + 6, x(x + 1) = 12, (x + 1)(x − 2) = 4, explaining why a product equal to a non-zero number says nothing about its factors. (A18)

• Fluency — direct questions on rearranging a quadratic before solving, 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).