Binomial Expressions — O/L Mathematics

Every time a builder works out the area of a plot whose sides are given as expressions, or a shopkeeper mentally squares 103 to price a bulk order, they are quietly using binomials. In your O/L, expanding brackets like (2x + 3y)(4x - 5y) is the engine behind factorising, solving quadratic equations, and simplifying algebraic fractions. Master this one skill cleanly now, and a whole run of later topics stops feeling frightening.