Author note — to cover (Higher)

Higher page, per the A18 braces. Solve from completed-square form by isolating the bracket and rooting both sides with plus and minus, giving exact surd answers like x = −3 ± √7 as well as rounded decimals. The completing itself is the sibling page; the formula is an alternative route. (A18)

• Fluency — direct questions on solving by completing the square, 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).