Author note — to cover (Higher)

Higher page, per the A13 braces. Sketch y = f(x + a) as a horizontal slide of a units opposite to the sign, on quadratics and trig graphs; track turning points and intercepts and name the wrong-direction trap. Stretches f(ax) are A level; combining with the vertical slide is fair. (A13)

• Fluency — direct questions on translating a graph left and right, 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).