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)

Introduction

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Practice and continue

Practice

Rearranging a quadratic before solving

Collecting everything on one side equal to zero before factorising.

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Completing the square

Writing x² + bx + c as a squared bracket plus a correction.