Author note — to cover

Expand products like (2x + 3)(3x − 1) and (5 − 2x)(x + 4), tracking coefficient products in the middle terms; include two-variable cases like (2x + y)(x − 3y). Both tiers — A4 leaves products of two binomials unbraced, so Foundation meets these too. Triple products are Higher. (A4)

Introduction

—coming soon—

Practice and continue

Practice

Double brackets with coefficients

Expanding (2x + 3)(3x − 1), keeping track of the middle terms.

Next lesson

Squaring a bracket

Writing (x + 4)² as a full double bracket, never just x² + 16.